SWL+

The Yuasa SWL+2250FR is the high-end safety variant of the powerful SWL+2250. It combines the enormous capacity of 86 Ah (C20) with a housing of the highest fire protection class (UL94 V-0).This VRLA-AGM block is specially designed for critical infrastructures where both maximum power density and the strictest safety requirements apply. As part of the SWL+ series, it not only offers up to 40% more discharge power than standard batteries, but also an extremely long service life of 12+ years. It is the ideal upgrade for UPS systems previously equipped with standard 75Ah or 80Ah batteries (e.g. NPL78-12).Highlights at a glanceFR safety housing (Flame Retardant): The housing and lid are made of flame-retardant ABS plastic in accordance with UL94 V-0. In the event of fire, the material self-extinguishes and prevents flaming dripping – a mandatory requirement for data centres and public buildings.Maximum capacity (86 Ah): With 86 Ah (at 20-hour discharge), this block offers one of the highest energy densities in the standard housing size (about 380 mm long). This means longer backup times for the same space requirement.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This drastically minimises the Total Cost of Ownership (TCO) due to much less frequent replacement cycles.SWL+ High Rate Performance: The code "2250" stands for the high power output (watts per block). Thanks to optimised plate structure, the battery delivers stable voltages even at extremely high discharge currents (typical for UPS systems).HT Element X Technology™: The patented alloy of the grid plates reduces internal corrosion and water loss. This makes the battery more resistant to ageing and temperature fluctuations.Maintenance-free & leak-proof: VRLA-AGM technology binds the electrolyte in the glass mat. No maintenance, no topping up with water, not hazardous goods (according to IATA).Areas of applicationThe SWL+2250FR is the standard for safety-critical large-scale systems:Data centres / Colocation: Maximum performance and maximum fire protection.UPS systems (UPS): As a powerful upgrade for existing systems.Safety lighting: Central battery systems (ZSV) according to EN 50171.Telecommunications: Switching centres and critical network nodes.Energy providers: Control technology in power plants and substations.Installation & safety notesNote weight: With 27.5 kg per block, handling is challenging. Lifting aids should be used when equipping high UPS racks.Tightening torque: The M6 terminal bolts must be tightened to 4.8 Nm. Correct fit is essential to avoid contact problems at high currents (short-circuit current >2000A).Installation position: Possible standing or lying on the long side.Ventilation: FR batteries also emit hydrogen in the event of a fault (overcharging). Battery rooms must be ventilated in accordance with EN 50272-2. Features ModelReplacement battery for Scanreco / Palfinger (Ultra-High-Power) Replaces Original No.**590**, **592**, **960**, 16131, EEA2512, RSC7220, 593 Chemistry**NiMH** (Nickel Metal Hydride) - High Energy Cells Voltage**7.2 V** Capacity**3000 mAh (3.0 Ah)** - The maximum for this format Suitable for CranesPalfinger, Effer, Fassi, HMF, Kranlim (RC400 / RC590 / RC960) Design"Bone" shape (identical dimensions as standard, fits in any compartment) Contacts2 side contact strips (self-cleaning when inserted) Special featureIdeal for transmitters with colour display or high power consumption Weight (g)approx. 380 - 410 (noticeably heavier due to high cell density)  FAQs for Yuasa SWL+2250FRCan I use this battery instead of an NPL78-12FR?Yes, this is a perfect upgrade. The NPL78-12FR is a standard long-life model (10 years, ~78Ah). The SWL+2250FR has the same dimensions, but offers 86Ah (+10% capacity), a higher high current output and a longer service life (12+ years). Just check if your charger can charge the slightly increased capacity.How can I recognise the FR version?Look for the "FR" in the name on the nameplate and the reference to "UL94 V-0". Visually, Yuasa FR batteries are often distinguished by a grey housing (as opposed to the black standard housing), but this can vary depending on the production batch. The nameplate is the deciding factor.What happens if I install a non-FR battery in an FR string?This jeopardises the insurance cover of the entire system. A single block with a standard housing (UL94 HB) cancels the fire protection certification of the whole rack. Always replace batteries in sensitive areas only with the correct FR type.

The Yuasa SWL+2000FR is the safety-optimised version of the SWL+ high-performance block. It combines the specific capacity of 57.6 Ah with the advanced SWL-Plus technology for high discharge currents and a housing with the highest fire protection class (UL94 V-0).This 12-volt battery is the first choice for critical UPS applications (Uninterruptible Power Supply) in data centres and public facilities. It bridges the gap between the smaller 40Ah blocks and the large 70Ah models and offers extremely high power density with a service life expectancy of 12+ years.Highlights at a glanceFR safety housing (Flame Retardant): The housing is made from flame-retardant ABS plastic in accordance with the standard UL94 V-0. This is a mandatory requirement in many modern tenders for server rooms and emergency lighting systems to prevent the spread of fire.Performance upgrade (SWL+): The model designation "2000" stands for the increased power output (watts per block) compared to older models (e.g. SWL1800). Despite the same capacity of 57.6 Ah this block supplies more energy for a short time to absorb voltage peaks.Eurobat "Very Long Life": Classified for a service life of 10 to 12 years (or 12+ years according to Eurobat 2015). This guarantees low operating costs (TCO) and long replacement intervals.Maintenance-free VRLA-AGM technology: Thanks to the recombination technology (>99% efficiency) and electrolyte bound in glass fibre, the battery is leak-proof and never needs to be topped up with water.Hybrid grid plates: The use of a special lead-calcium-tin alloy (commonly referred to as HT Element X) reduces internal corrosion and self-discharge, which improves shelf life and service life even under demanding float charge conditions.Areas of applicationThe SWL+2000FR is designed for systems with high safety requirements:Data centres / data centers: Where minimising the fire load is a priority.UPS systems: As an upgrade for older 55-60Ah batteries.Telecommunication: In switching centres and containers.Safety lighting: According to EN 50171 / VDE 0108.Switchgear: In power supply systems.Assembly & safetyTightening torque: The M6 terminal bolts must be tightened to approx. 4.8 Nm. Tightening too loosely will lead to contact resistance and heat build-up, tightening too tightly can destroy the lead threads.Mounting position: The battery can be mounted upright or on its side (but not permanently upside down).Ventilation: Battery rooms must be ventilated in accordance with EN 50272-2.Charging voltage: 2.275 V/cell ±1% at 20°C (13.65 V block voltage). Features  ModelYuasa SWL+2000FR (Flame Retardant) Housing specification**Flame retardant** to UL94 V-0 (safety standard) Voltage12 V Capacity (C10)**57.6 Ah** (precision value for UPS sizing) Technology**AGM VRLA** (High Rate - high current resistant) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 229 x 138 x 207 (compact 60Ah-class) Connection**M6 female thread** (female) Weight (kg)approx. 22.0 kg Field of applicationUPS systems in data centres, emergency lighting, telecoms  FAQs about the Yuasa SWL+2000FRDoes the SWL+2000FR replace the old SWL1800FR?Yes. The SWL+2000FR is the direct, more powerful successor model. The dimensions (224 x 135 x 207 mm) are generally identical, so it fits into the same shelves or cabinets. You gain additional power reserve (higher watt emission possible) and service life.What is the difference between 57.6 Ah and the designation "2000"?This is a common mix-up:57.6 Ah: Is the capacity (how much current flows over a long period of time, e.g. 10 or 20 hours).2000: Refers to the power (watts), which the block can provide for the UPS for a short period (e.g. for 10 minutes). The SWL+2000 delivers more here than a standard 57Ah battery.How do I recognise if my old battery was "FR"?Look at the nameplate. It should state "FR" or "UL94 V-0". Often (but not always) FR housings at Yuasa are grey rather than black. If your system is located in a public building or data centre, it is highly likely that you must use FR batteries again.

The Yuasa SWL+1950 (often listed as SWL+1950FR) is a technological leap in the VRLA class. As part of the new SWL+ Series replaces or supplements models in the standard SWL range (such as the SWL1850) and offers a high level of reliability at identical dimensions significantly higher performance.With a nominal capacity of 74 Ah (C20) and an extremely high energy density, this 12-volt block is specially designed for modern UPS systems that need to realise maximum bridging times in the smallest of spaces. Thanks to the use of the new Hybrid pure lead technology and the patented HT Element X Alloy the SWL+1950 achieves a service life expectancy of up to 15 years.Highlights at a glanceSWL+ performance upgrade (74 Ah): This battery delivers more energy in the same form factor as older 65-70Ah blocks (e.g. SWL1850). You can achieve longer runtimes without having to modify your battery cabinets.Hybrid pure lead technology: The mixture of primary pure lead and advanced alloys reduces the internal resistance and massively improves the corrosion resistance of the grid plates.HT Element X Alloy™: An exclusive alloy from GS Yuasa that minimises grid corrosion (the main cause of battery ageing) and slows down water loss. This allows operation even at slightly higher temperatures (e.g. 25°C) without immediately shortening the service life drastically.Eurobat "Very Long Life": Classified for a service life of 12+ years. Under optimum conditions, the design life is even up to 15 years.Maximum energy density: Ideal for data centres where the price per square metre of floor space is high. You get more kilowatts per square metre (kW/m²).Ultra-fast recharging: Thanks to the low impedance and the pure lead structure, the battery absorbs charge more quickly, which increases the availability of the UPS after a failure (repeated outage).Assembly & MaintenanceTightening torque: The M6 terminal screws should be used with approx. 4.8 Nm must be tightened. Check the torque as part of the annual maintenance.Charging voltage: The float charge voltage is 2.275 V/cell (13.65 V per block) at 20°C.Temperature: Thanks to the HT Element X technology, the battery is more tolerant of temperatures up to 25°C, but an ambient temperature of 20°C is recommended for maximum service life (15 years). Features Model / ClassYuasa SWL Series (High Rate - 74Ah Class) Voltage12 V Capacity (C10)**74.0 Ah to 76.0 Ah** (depending on discharge rate) Technology**AGM VRLA** (Absorbent Glass Mat - valve regulated) Performance (10 min)Extremely high wattage per cell (High Rate Plus) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 261 x 168 x 230 (standard size for this performance class) Connection**M6 internal thread** (bolt) Weight (kg)approx. 24.0 - 26.0 kg Case optionOften available as **FR** (Flame Retardant)  FAQs about the Yuasa SWL+1950Will the SWL+1950 fit in my cabinet if I previously had SWL1850?Yes. The dimensions (350 x 166 x 174 mm) are the industrial standard for this class. You can use the SWL+1950 as a "drop-in replacement" and immediately benefit from the higher capacity (74Ah instead of 66Ah) and longer service life.What does "hybrid pure lead" mean?Classic batteries use lead-calcium-tin grids. Pure lead batteries (Thin Plate Pure Lead) are extremely powerful, but often more expensive and more sensitive when charging. The Hybrid technology of the SWL+ series combines the robustness of standard alloy (in the negative plate) with the performance of pure lead (in the positive plate) to offer the best of both worlds: High performance and long life at moderate cost.Is the housing always flame retardant?The SWL+ series is often used as a standard FR (Flame Retardant / UL94 V-0) as it is intended for critical infrastructures (data centres). Look for the imprint "FR" or the grey cover/case colour (depending on the batch) to be sure.

The Yuasa SWL+1850-6FR is a powerful 6-volt monoblock from the proven SWL-Plus series. Unlike the widespread 12V blocks, this particular 6V battery is used in large UPS systems and industrial applications where high capacities (148 Ah) and robust thermal stability are required.The addition "FR" (Flame Retardant) guarantees maximum safety thanks to a flame-retardant housing to UL94 V-0. With a service life classification of 12+ years (Very Long Life) this battery is the backbone for critical infrastructures where there can be no compromise on availability.Highlights at a glanceSpecific 6V performance (148 Ah): This block delivers a nominal capacity of 148 Ah. Thanks to the 6V design (3 massive cells), it offers higher cycle stability and thermal stability than comparable 12V solutions.SWL+ High Rate Technology: The SWL+ series is not only focused on capacity, but is optimised for performance. It offers up to 40% more discharge current than standard batteries, ideal for short, intensive discharge phases in UPS systems.Maximum fire protection (UL94 V-0): The housing is made of flame-retardant ABS plastic. In the event of an internal fault or external fire, the material prevents the spread of fire – a mandatory requirement for public buildings and data centres.Eurobat "Very Long Life": Designed for a service life of 10 to 12 years (or 12+ years classification). Thanks to the special lead-calcium-tin alloy, corrosion is minimised.Maintenance-free operation: Thanks to AGM technology (Absorbent Glass Mat), the electrolyte is bound in the mat. The battery does not gas in normal operation (recombination >99%) and never needs topping up with water.Advantages of 6-volt technologyWhy use 6V blocks instead of 12V blocks?Thermal management: As the housing surface area is larger in relation to cell number, heat can be dissipated better during high current discharges.Robustness: The thicker lead plates in 6V blocks are often more resistant to corrosion than the finer plates in compact 12V batteries.Error reduction: Fewer cells per block means statistically less probability of failure per unit.Installation and safety instructionsObserve weight: At over 32 kg, this block is substantially heavier than typical 12V server batteries. Use lifting aids or work in pairs when equipping racks.Tightening torque: The M8 terminal bolts are designed for high currents. The recommended torque is usually 6 Nm. Loose connections can lead to dangerous arcing with the currents flowing here.Ventilation: Although VRLA batteries are regarded as "sealed", battery rooms must be ventilated according to EN 50272-2 to remove any hydrogen that may escape in the event of a fault.Charging voltage: In float charging mode (Float) 2.275 V/cell is required. For the 6V block this corresponds to 6.825 Volt (±1%) at 20°C. Features ModelYuasa SWL+1850-6FR (6V High Rate) Voltage**6 V** (3 cells) - Warning: Not a 12V block! Capacity (C10)**180 Ah** (nominal capacity at 10 hrs) Housing**FR** (Flame Retardant / Flame-resistant to UL94 V-0) Design Life**10 - 12 years** (EUROBAT: Long Life) PerformanceOptimised for high current discharges (short bridging time) Dimensions (L x W x H in mm)approx. 297 x 168 x 232 (typical size for large 6V blocks) Connection**M8 internal thread** (for solid cable connections) Weight (kg)approx. 32 - 34 kg (Heavy duty due to high lead density) ApplicationLarge UPS systems, telecoms backup, emergency power  FAQs about the Yuasa SWL+1850-6FRCan I mix this 6V battery with 12V batteries?Never in series. You must never mix 6V and 12V blocks in a serial string, as the internal resistances and charging voltages are completely different. This would lead to immediate destruction of the batteries.What does "SWL 1850" mean?This is a power value of the Yuasa nomenclature. The number often stands for the wattage per block (at a 10-minute discharge). It marks the enormous high current capacity of the cell, which far exceeds what a standard battery of the same size can handle.Why is this battery so heavy (32kg)?Lead is heavy. As this battery has a high capacity and massive plates for a long service life (12+ years), the high weight results from this. This is a sign of quality – lighter batteries of the same size often have thinner plates and a shorter lifespan.

The Yuasa SWL+800 is a compact high-performance monobloc from the premium SWL+ Series. With a nominal capacity of 25 Ah (often up to 28 Ah at C20 depending on specification), this 12V battery offers exceptional power density in a very common form factor.It is the technical upgrade to standard 24Ah class batteries (such as the NPL24-12) and has been specially developed for applications where high discharge currents are required in a small space. Thanks to the Eurobat "Very Long Life" classification, it is ideal for critical UPS systems where reliability and long replacement intervals are crucial.Highlights at a glancePower upgrade (800 watts): The designation "800" stands for the increased power output (watts per block during short-term discharge). Compared to standard 24Ah batteries, the SWL+800 delivers significantly more energy to ensure short bridging times at high loads.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This clearly sets it apart from standard batteries (often 5 or 10 years) and reduces the long-term operating costs (TCO).Compact power (25 Ah): Offers maximum capacity in a standard housing size (approx. 166 x 175 x 125 mm). It often fits, without conversion, into existing UPS cabinets or battery cassettes and increases their runtime.HT Element X technology: The advanced grid alloy reduces internal corrosion and self-discharge. This ensures high reliability even in "standby" operation over many years.Maintenance-free AGM technology: VRLA design (valve regulated) with electrolyte bound in glass fibre. The battery is leak-proof, vibration-resistant and can be operated in any position (except permanently upside down).Robust housing: Made from impact-resistant ABS plastic (optionally also available as FR version with flame-retardant UL94 V-0 housing).Areas of applicationThe SWL+800 is ideal for compact but powerful systems:UPS systems (UPS): Especially in rack-mount systems or external battery modules (EBM).Emergency lighting: Central battery systems.Telecommunication: Smaller distribution stations.Medical technology: Buffering of critical devices.Safety technology: Alarm systems with high power requirements.Assembly & operating instructionsConnection: The battery usually features M5 internal thread. The recommended tightening torque is 2.5 Nm. Use a suitable tool to avoid damaging the thread.Installation position: Thanks to VRLA technology, operation standing or lying on the side is possible.Charging voltage: Trickle charge at 2.275 V/cell (±1%) at 20°C. This corresponds to 13.65 V for the block.Storage: If stored without charging, a recharge should occur after 6 months at the latest (at 20°C) to prevent sulphation. Features  ModelYuasa SWL+800 (High Performance) Voltage12 V Capacity (C10)25.0 Ah (up to approx. 28 Ah with C20) Performance (10 min)approx. 800 watts per block (high rate) TechnologyAGM VRLA (sealed, maintenance-free) Design Life10 - 12 years (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 166 x 175 x 125 (standard size of the 24-26Ah class) ConnectionM5 internal thread (female thread) Weight (kg)approx. 9.0 - 9.6 kg Field of applicationCompact UPS systems, wheelchairs (high power), starter boosters  FAQs for Yuasa SWL+800Can I use the SWL+800 as a replacement for an NPL24-12?Yes, absolutely. The dimensions are identical or almost identical. However, with the SWL+800 you get a significant upgrade: More high-current performance (important for UPS) and a longer service life (12+ years instead of 10 years). Just check that your charger matches the capacity (which is usually the case).What does the number "800" mean?The number refers to the power in watts per block (typically at 10 min. discharge). It characterises the battery as a high-current type that can supply far more energy for a short time than a standard 25Ah battery.Is the thread M5 or M6?In this housing class (24-28 Ah), M5 is the standard at Yuasa. From the next larger class (38 Ah), it is usually changed to M5 or M6. For safety, check your connection cables or cable lugs. 

The Yuasa SWL+850 is a compact high-performance monoblock from the proven SWL+ Series. With a nominal capacity of 28.8 Ah (C20), this 12-volt battery offers one of the highest energy densities technically possible in this housing format.It is the powerful upgrade to the standard models (such as SWL750 or NPL24-12). By optimising the internal plate structure, the SWL+850 delivers significantly more energy and higher discharge currents without taking up more space in the battery cabinet. Thanks to the Eurobat "Very Long Life" classification, it is the ideal choice for UPS systems that need to run reliably for over a decade.Highlights at a glanceMaximum capacity (28.8 Ah): With almost 29 Ah, this block offers approx. 20% more energy than standard batteries in the 24Ah class. This enables longer autonomy times on the same footprint.SWL+ power upgrade (850 watts): The code number "850" stands for the increased power output (watts per block during short-term discharge). It is specially designed for modern UPS systems that have to cope with high inrush currents.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This significantly minimises maintenance and replacement costs (TCO).HT Element X technology: The advanced lead-calcium-tin alloy of the grid plates reduces internal corrosion and self-discharge. This ensures maximum reliability even in years of standby operation.Maintenance-free AGM technology: VRLA design (valve regulated) with electrolyte bound in glass fibre. The battery is leak-proof, vibration-resistant and can be installed in any position (except permanently upside down).Compatible housing: Despite the increased capacity, the SWL+850 uses the standard housing size (approx. 166 x 175 x 125 mm), making it a direct "drop-in upgrade" for weaker batteries.Areas of applicationThe SWL+850 is ideal for compact systems with maximum energy requirements:UPS systems (UPS): Ideal for rackmount systems and external battery packs (EBM).Telecommunication: Mobile radio stations and outdoor cabinets.Emergency lighting: Central battery systems (CBS) with high load.Starting applications: Generators (gensets), provided the cold cranking current is sufficient.Security technology: Intruder alarm systems and fire alarm panels.Technology & AdvantagesThe SWL+850 differs technically from standard batteries:Dense packing: Thinner, but more corrosion-resistant plates fit more active lead mass into the housing. This results in the high capacity of 28.8 Ah.Low internal resistance: The internal structure is optimised for fast current flow (High Rate Discharge). This means the voltage remains stable even under sudden high load (mains failure).Recombination: The VRLA system ensures that gases generated inside are recombined into water. No electrolyte escapes, and the battery does not dry out.Assembly & Operating instructionsConnection: The battery has M5 female thread. The recommended tightening torque is 2.5 Nm. Use a suitable tool to avoid damaging the thread in the soft lead.Charging voltage: Float charging (standby) at 2.275 V/cell (±1%) at 20°C. This corresponds to 13.65 V for the block.Temperature: The service life is based on 20°C. Permanently higher temperatures (e.g. 30°C) chemically reduce service life by approx. 50%.Storage: Thanks to low self-discharge (<3% per month) storable. Recharging should take place at the latest after 6 months. Features  ModelYuasa SWL+850 (High Rate Performance) Voltage12 V Capacity**28.8 Ah** (C20) / **27.0 Ah** (C10) Performance (10 min)approx. **850 watts** per block Technology**AGM VRLA** (sealed, maintenance-free) Design life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 166 x **125** x **175** (Note: upright format!) Connection**M5 female thread** (Female) Weight (kg)approx. 10.3 kg ApplicationUPS systems (often replacement for 24Ah/26Ah with tall design)  FAQs about the Yuasa SWL+850What is the difference to the SWL750?The SWL+850 is the more powerful successor model or the high-performance variant.SWL750: approx. 24-25 Ah capacity / 750 watts output.SWL+850: 28.8 Ah capacity / 850 watts output. The dimensions are identical. You can use the SWL+850 to give an old UPS "more life" (runtime).Is the SWL+850 also available in a flame-retardant version?Yes. The model SWL+850FR has a casing complying with UL94 V-0. If you install the batteries in public buildings or data centres, you should check whether the FR version is required.Is the thread M5 or M6?In this housing size (up to approx. 30Ah), Yuasa generally uses M5 as standard. Only from larger models (such as SWL1100 / 40Ah) does the standard change to M5 or M6, and for the very large to M8

The Yuasa SWL+800FR is the safety-optimised premium version of the compact SWL+ high-performance block. It combines a nominal capacity of 25 Ah (often specified up to 28Ah at C20) with advanced SWL-Plus technology for high discharge currents and a housing with the highest fire protection class (UL94 V-0).This 12V battery is ideal for critical UPS systems in sensitive areas (offices, public buildings, medical facilities) where fire protection regulations must be strictly observed. It offers maximum performance in the widely used "24Ah form factor" and is characterised by an extremely long service life of 12+ years. This makes it the most powerful upgrade for standard batteries of this size.Highlights at a glanceFR safety housing (Flame Retardant): The housing and lid are made from flame retardant ABS plastic in accordance with UL94 V-0. In the event of fire, the material self-extinguishes and prevents burning dripping – a crucial safety factor in IT racks.SWL+ performance upgrade (800 Watt): The "800" rating illustrates the increased output (watts per block). Compared to standard batteries (such as the NPL24-12), this battery delivers significantly more energy for a short period to reliably catch voltage dips during power failure.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This guarantees planning reliability and minimises replacement cycles, which significantly reduces operating costs (TCO).Compact capacity (25 Ah): With 25 Ah, it offers high energy density at standard dimensions. It is excellent as a powerful and long-life upgrade for systems previously equipped with standard 24Ah batteries.Maintenance-free VRLA-AGM technology: Thanks to recombination technology (>99% efficiency) and electrolyte absorbed in glass mat, the battery is leak-proof, vibration-resistant and never needs to be topped up with water.HT Element X Technology: The special lead-calcium-tin alloy reduces internal corrosion and self-discharge. The battery remains ready for use even after extended storage and withstands float charging for many years.Areas of applicationThe SWL+800FR is designed for compact systems with high safety requirements:UPS systems (rackmount): External battery modules (EBM) for server UPS systems.Emergency lighting: Central battery systems in public buildings according to EN 50171.Telecommunications: Smaller distribution stations and switch cabinets (outdoor cabinets).Medical technology: Emergency power supply for mobile or stationary devices.Alarm systems: Fire alarm control panels with high current requirements.Technology & advantagesThe SWL+800FR differs significantly from standard batteries thanks to its internal construction:Hybrid grid plates: The special alloy (often called HT Element X) minimises the corrosion of the positive plates, which is the main cause of battery ageing under standby operation.High current design: The number and surface area of the plates are optimised to reduce internal resistance. This enables very high current output (high rate discharge) without noticeable voltage drop, which is essential for UPS systems.VRLA recombination: Pressure relief valves control the gas pressure inside. When properly charged, the resulting gas recombines to form water – the system is completely maintenance-free.Installation & safety instructionsConnection: The battery has M5 internal thread. The recommended tightening torque is 2.5 Nm. Use suitable tools to avoid overtightening the thread.FR compliance: If your system specifies FR batteries (V-0), you must not use standard batteries (HB) as replacements, as this would endanger the fire protection status of the system.Installation position: Standing or lying on the side is possible (not upside down).Charge voltage: 2.275 V/cell ±1% at 20°C (equals 13.65 V block voltage). Features  ModelYuasa SWL+800FR (Flame Retardant) Housing specification**Flame retardant** according to UL94 V-0 (self-extinguishing) Voltage12 V Capacity (C10)**25.0 Ah** (High Rate Performance) Performance (10 min)approx. **800 Watt** per block Technology**AGM VRLA** (Sealed, maintenance-free, FR case) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 166 x 175 x 125 (standard size of the 24-26Ah class) Connection**M5 internal thread** (female) Weight (kg)approx. 9.6 kg  FAQs about the Yuasa SWL+800FRIs the SWL+800FR better than an NPL24-12FR?Yes, definitely. The NPL24-12FR is a standard long-life battery (approx. 10 years, standard performance). The SWL+800FR has identical dimensions, but offers more performance (High Rate for UPS), a longer service life (12+ years) and a slightly higher capacity (25Ah vs 24Ah). It is the premium upgrade.How do I recognise the FR version?Look for the "FR" on the type plate name and the reference to "UL94 V-0". Often FR housings are grey at Yuasa (unlike the standard black housing), but the type plate is the crucial feature.Can I use this battery for my electric wheelchair?No, not recommended. The SWL series is optimised for standby mode (continuous charging). Power wheelchairs require cyclic batteries (daily charging/discharging). It is better to use the Yuasa REC22-12 or NPC24-12. These have the same size but last much longer in wheelchair use.

The Yuasa SWL+1200 (often also referred to as SWL1200 or SWL Plus) is the Premium further development of the proven SWL1100. As part of the SWL+ Series this battery offers an extremely high energy density paired with a significantly extended service life (Very Long Life).With a capacity of 40.6 Ah and state-of-the-art hybrid pure lead technology this 12V battery is specially designed for critical UPS systems (uninterruptible power supply), where reliability and long maintenance intervals are of paramount importance. Thanks to VRLA-AGM technology, it is completely maintenance-free and leak-proof.Highlights at a glanceSWL+ Performance Upgrade: The SWL+ (Plus) series offers improved grid plate technology for an even longer service life compared to the standard SWL series.Eurobat "Very Long Life": Classified for 12+ years service life (design life up to 15 years at 20°C), which massively reduces replacement intervals and operating costs (TCO).Maximum discharge performance: Provides up to 40% more discharge current (watts per cell) than standard batteries of the same size (NPL series), ideal for short bridging times.Hybrid pure lead technology: The use of a special lead-calcium-tin alloy with pure lead components drastically reduces self-discharge and corrosion.Compact power: Despite the high capacity of 40.6 Ah, it retains the compact standard dimensions (approx. 197 x 165 mm), so it fits in standard UPS cabinets.Safety: ABS plastic housing (optionally flame-retardant according to UL94 V-0 as FR version) with integrated gas recombination.Areas of applicationDue to its high current capability and long service life, the SWL+1200 is the first choice for:UPS systems (UPS): Data centres, banks, hospitals (critical infrastructure).Telecommunication: Base stations and switching centres.Emergency lighting systems: Central battery systems according to EN 50171.Starting applications: Emergency power generators (gensets).Renewable energies: Buffering in standalone solar systems (limited, as the focus is on standby).Technology & advantagesThe SWL+1200 is technically very different from standard batteries:HT Element X Alloy: An exclusive alloy from Yuasa minimises corrosion of the positive plates, the main cause of battery aging.AGM separator (Absorbent Glass Mat): The electrolyte is completely bound in glass fibre fleece. This allows installation in almost any position (except permanently upside down) and prevents acid stratification.VRLA (Valve Regulated Lead Acid): Pressure relief valves regulate the gas pressure inside. When charged correctly, the gas recombines to form water – no topping up necessary.Assembly & operationCharging voltage (standby): 2.275 V/cell (±1%) at 20°C. This corresponds to 13.65 V for the 12V block.Torque: The M5 terminal screws should be tightened with 2.5 Nm. Too tight can damage the thread in the lead post, too loose leads to contact resistance and heat.Storage: Thanks to low self-discharge (<3% per month) suitable for storage. A recharge (Refresh Charge) should be performed after 6 months at the latest to prevent sulphation. Features ModelYuasa SWL1200 (Industrial VRLA battery) Type**High Performance AGM** (lead-fleece battery) Voltage12 V Capacity (C10)**40.6 Ah** (at 10 hours discharge) Power (Watt)Optimised for short discharge times (High Rate Discharge) Design Life (service life)**10 - 12 years** (EUROBAT: Long Life) ApplicationUPS systems (UPS), safety lighting, telecommunications Dimensions (L x W x H in mm)approx. 197 x 165 x 170 (standard block size for server racks) Connection**M5 internal thread** (female thread) Weight (kg)approx. 14.0 - 14.5 kg  FAQs about the Yuasa SWL+1200What is the difference between the SWL1100 and the SWL+1200?Both batteries have the same dimensions and almost identical capacity values (40.6 Ah). The difference lies in the service life:SWL1100: Eurobat "Long Life" (10-12 years).SWL+1200: Eurobat "Very Long Life" (12+ years / 15 years design life). The "+" version uses higher quality materials for an even longer service life in critical systems.Can I install this battery horizontally?Yes.AGM technology binds the acid firmly in the fleece. There is no free liquid. You can install the battery standing or lying on its side. Only "upside down" mounting (terminals pointing downwards) is permanently not permitted, as this would impair the function of the safety valves.Is the battery suitable for cyclical applications (e.g. wheelchair)?Conditionally, but not recommended.The SWL series is optimised for "float charge" (continuous charge/standby). It delivers extremely high currents, but is not designed for daily deep discharge and recharging (cycle operation). For wheelchairs or golf caddies it is better to use the Yuasa REC or NPC Series.

The Yuasa SWL+850FR is the high-end safety version of the powerful SWL+850 monobloc. It combines an exceptionally high capacity of 28.8 Ah (C20) with a housing of the highest fire protection class (UL94 V-0).This 12V battery was specially developed for critical UPS applications in sensitive environments (data centres, banks, hospitals). It offers maximum energy density in the compact footprint of a standard 24Ah battery while meeting the strictest safety requirements. With a service life of 12+ years the SWL+850FR is the ultimate upgrade for compact UPS systems.Highlights at a glanceFR safety housing (Flame Retardant): The case and lid are made of flame-retardant ABS plastic according to the UL94 V-0 standard. In the event of a fire, the material self-extinguishes and prevents burning dripping – a must for many server rooms.Maximum capacity (28.8 Ah): With almost 29 Ah, this unit offers approx. 20% more energy than standard batteries of the same size (e.g. NPL24-12). This enables significantly longer backup times without loss of space.SWL+ power upgrade (850 watts): The number "850" stands for the increased power output (watts per block). The battery is optimised to safely handle the high inrush currents of modern IT loads.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This minimises the total cost of ownership (TCO) due to extremely long replacement intervals.HT Element X Technology: The special lead-calcium-tin alloy reduces internal corrosion and self-discharge. This makes the battery resistant to ageing, even during years of standby operation.Maintenance-free & Safe: VRLA-AGM technology (Absorbent Glass Mat). The electrolyte is bound in the fleece, the battery is leak-proof, vibration-resistant and does not require topping up with water.Areas of applicationThe SWL+850FR is designed for compact systems with the highest safety and performance requirements:UPS systems (UPS): High-performance upgrade for rackmount UPSs and external battery modules.Safety lighting: Central battery systems in public buildings (fire protection!).Telecommunications: Mobile phone stations and outdoor enclosures.Medical technology: Protection of critical equipment.Security technology: Fire alarm panels and alarm systems.Technology & advantagesThe SWL+850FR offers technical features that set it apart from standard batteries:Dense packing: Advanced grid designs allow more active mass to fit into the standard case (166 x 175 x 125 mm), enabling the jump from the usual 24Ah to 28.8Ah.Flame retardancy: While standard cases (UL94 HB) may burn, the V-0 plastic ensures that the battery does not become a source of fire or propagate flames.Recombination: The sealed system recombines gases into water. No acid escapes, making it safe for use in office environments or IT racks.Installation & safety instructionsConnection: The battery has M5 internal thread. The recommended tightening torque is 2.5 Nm. Use suitable tools to avoid damaging the thread.FR requirement: If your installation specifies FR batteries, you may not use standard batteries (HB) as a replacement. Never mix FR and non-FR batteries in a string.Installation position: Standing or lying on the side possible (not upside down).Charging voltage: 2.275 V/cell ±1% at 20°C (corresponds to 13.65 V block voltage). Features  ModelYuasa SWL+850FR (Flame Retardant) Housing specification**Flame retardant** according to UL94 V-0 (safety standard) Voltage12 V Capacity**28.8 Ah** (C20) / **27.0 Ah** (C10) Performance (10 min)approx. **850 watts** per block Technology**AGM VRLA** (Sealed, Maintenance-free, FR-Case) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 166 x **125** x **175** (classic "portrait format") Connection**M5 internal thread** (Female) Weight (kg)approx. 10.3 kg  FAQs about the Yuasa SWL+850FRDoes the SWL+850FR replace the NPL24-12FR?Yes, and it improves the system.The mechanical dimensions are identical. However, the SWL+850FR offers 28.8 Ah (instead of approx. 24 Ah) and a longer service life (12+ years instead of 10 years). So you get more runtime and durability with the same space requirement and the same safety (both FR).What does "FR" mean and why do I need it?"FR" stands for Flame Retardant (flame retardant). In public buildings, airports and professional data centres, fire protection certificates and insurance often require that all plastics used are self-extinguishing (UL94 V-0) to minimise the fire load.Will this battery fit in my UPS cassette (RBC)?Most likely yes.Many UPS manufacturers (such as APC, Eaton etc.) use standard blocks of the size ~24-28Ah in their battery cassettes (RBCs). If your old batteries were approx. 16.5 x 17.5 x 12.5 cm and had M5 connections, the SWL+850FR is the perfect high-performance replacement.

The Yuasa SWL+2250 is one of the most powerful 12V models in the SWL+ Series. With a remarkable capacity of 86 Ah (C20), this battery offers an extremely high energy density with consistently compact dimensions.This VRLA-AGM block was developed to replace older standard batteries in the 75-80Ah class (such as the NPL78-12) and at the same time to offer significantly more power and a longer service life. Thanks to the advanced plate technology and the Eurobat "Very Long Life" classification, the SWL+2250 is the ideal solution for demanding UPS systems where every centimetre of footprint and every year of service life counts.Highlights at a glanceMaximum capacity (86 Ah): With 86 Ah (when discharged for 20 hours), this battery delivers up to 10-15% more energy than conventional batteries of the same format (often 75-78 Ah). This noticeably extends your autonomy time in case of a power failure.SWL+ High Rate Performance: The figure "2250" stands for the enormous power output (watts) at short discharge times. The SWL+ series is optimised to provide high currents without heavy voltage drop, which is essential for modern IT loads.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). The investment pays off due to less frequent replacement intervals and lower maintenance requirements.HT Element X Alloy™: The patented hybrid grid technology minimises internal corrosion and water loss. This makes the battery more resistant to ageing, even if the environmental conditions are not always perfect.Maintenance-free AGM technology: Sealed and valve regulated (VRLA). The electrolyte is held in the glass mat, which permits operation in almost any position (apart from long term upside-down) and prevents acid stratification.Compatible case: Despite the increased output, the SWL+2250 uses the standard case size (approx. 380 mm length), which allows it to serve as a direct "upgrade" in existing battery cabinets.Compatibility & upgrade potentialThe SWL+2250 is often mechanically compatible with the widely used NPL78-12 or SWL2500 (depending on year and exact dimensions). The key advantage when switching to the SWL+2250 is the power density: you get significantly more kilowatts on the same footprint. This is especially important in data centres where space is expensive.Assembly & operating instructionsWeight warning: With approx. 27.5 kg this block is very heavy. When mounting on upper rack levels, pay attention to the shelf load and use lifting aids.Connection: The M6 terminal bolts must be tightened to 4.8 Nm. Check the torque after the first weeks of operation, as lead can settle slightly under pressure ("cold flow").Charging voltage: Trickle charge (float) at 2.275 V/cell (±1%) at 20°C.Temperature: The optimum life is achieved at 20°C. Permanently higher temperatures (e.g. 30°C) chemically halve the service life of VRLA batteries. Features ModelYuasa SWL+2250 (High Rate Plus) Voltage12 V Capacity**86.0 Ah** (C20) / approx. **76-80 Ah** (C10) Technology**AGM VRLA** (recombination technology, maintenance-free) PerformanceOptimised for short discharge times with high currents Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 261 x 168 x 202 (height above terminals approx. 227) Connection**M6 female thread** (Female Thread) Weight (kg)approx. 26.0 - 27.0 kg ApplicationLarge UPS systems, emergency power, telecommunications  FAQs about the Yuasa SWL+2250Can I use the SWL+2250 as a replacement for the NPL78-12?Yes, in most cases. The dimensions (length approx. 380mm, width 166mm) are industry standard. However, the SWL+2250 offers 86 Ah instead of 78 Ah and a longer service life (12+ years vs. 10 years). Just check that your charger is strong enough to recharge the slightly higher capacity in the time required (usually not a problem).Is the SWL+2250 also available in "FR" (flame retardant)?Yes. Like almost all batteries in the SWL+ series, the 2250 is often available as SWL+2250FR. When using the battery in public buildings or sensitive IT environments, you should expressly order the FR version (UL94 V-0).Is this battery suitable for motorhomes?Conditionally, but not ideal. The SWL+ series is a pure standby battery (emergency power). It delivers extremely high current for a very short period. However, in a motorhome the battery is discharged slowly and recharged daily (cyclic operation). For this purpose, batteries of the Yuasa REC, NPC or special gel/LiFePO4 batteries are more economical and durable.

The Yuasa SWL+1200FR is the safety-optimised version of the proven SWL+ high-performance battery. The abbreviation "FR" stands for Flame Retardant (flame retardant). This 12V block not only offers the extremely high energy density and longevity of the SWL+ series (40.6 Ah), but also has a housing of the highest fire protection class (UL94 V-0).This makes this battery the mandatory choice for installations in areas with increased safety requirements, such as public buildings, airports, hospitals or data centres, where fire safety regulations must be strictly adhered to. It combines maximum reliability (Very Long Life) with maximum building protection.Highlights at a glanceFR safety housing (Flame Retardant): The housing and cover are made of flame-retardant ABS plastic in accordance with the standard UL94 V-0. In the event of fire, the material extinguishes itself and prevents the spread of fire.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This minimises replacement cycles and lowers the total cost of ownership (TCO).Maximum power density (SWL+ technology): Delivers up to 40% more discharge power than standard batteries (NPL series) of the same size. Ideal for the high short-duration currents of modern UPS systems.Maintenance-free VRLA-AGM technology: Thanks to recombination technology, no topping up with water is necessary. The electrolyte is bound in the fibreglass fleece (AGM), which makes the battery leak-proof.Hybrid grid plates: The special grid alloy of the SWL+ series drastically reduces corrosion and self-discharge, which increases storage life and durability.Compact dimensions: Despite 40.6 Ah capacity, it fits into the standard slots (approx. 197 x 165 mm) and replaces less powerful batteries (e.g. 38 Ah) 1:1.Fire protection & safety (FR specification)The crucial difference to the standard SWL+1200 is the housing material.Standard (HB): Burns slowly, but keeps burning.FR (V-0): Must extinguish within 10 seconds in the vertical burn test; no burning dripping permitted. In many tenders for data centres, telecommunications equipment and emergency lighting systems in escape routes, the use of batteries with UL94 V-0 housing is now mandatory to ensure insurance cover and operating authorisation.Areas of applicationThe SWL+1200FR is designed for critical infrastructures:UPS systems (UPS): Especially in server rooms and data centres with high fire load density.Safety lighting: Central battery systems according to EN 50171.Telecommunication: Switching centres and masts.Energy provider: Switchgear and controls.Starting applications: Emergency diesel generators in buildings.Technology & structureThe SWL+1200FR uses the most advanced lead-acid technology:VRLA (valve regulated): Each cell has a low-pressure safety valve that releases excess gas during significant overcharge. Under normal operation, over 99% of the gases recombine to water.AGM separators: The microporous glass fleece binds the acid and ensures minimum internal resistance – key for extremely high discharge currents (High Rate Performance).Electrode structure: Optimised plate design for rapid energy release and fast recharging after a mains failure.Assembly & operating instructionsCharging voltage (float charge): 2.275 V/cell ±1% (corresponds to 13.65 V per block at 20°C).Temperature compensation: If temperatures are permanently above 20°C, the charging voltage should be reduced (-3mV/cell/°C) to avoid drastically shortening the service life.Tightening torque: The M5 screws should be tightened to 2.5 Nm.Installation position: Can be installed horizontally or vertically (not permanently upside down). Features ModelYuasa SWL+1200FR (Flame Retardant) Special feature "FR"**Flame retardant housing** (UL94 V-0 standard) Voltage12 V Capacity (C10)**40.6 Ah** (at 10 hours discharge) Performance (10min)Extremely high discharge rate (ideal for UPS bridging) Design Life**10 - 12 years** (EUROBAT: Long Life) Field of applicationCritical infrastructure, data centres, safety lighting Dimensions (L x W x H in mm)approx. 197 x 165 x 170 Connection**M5 internal thread** (female thread) Weight (kg)approx. 14.5 kg  FAQs about the Yuasa SWL+1200FRCan I mix "FR" batteries with normal batteries?Technically yes, safety-wise no. Electrically, the SWL+1200 and SWL+1200FR are identical. However, if you replace a single block in a string consisting of FR batteries with a standard battery, you lose the fire protection certification of the system for the entire string ("chain"). In addition, batteries should always be replaced as a batch (same age).How can I recognise the FR version visually?Yuasa usually marks the FR versions with a grey cover/housing (as opposed to the often black standard housing) or by a distinct imprint "FR" or "UL94 V-0" on the type plate.Is the SWL+1200FR more expensive than the standard version?Yes, slightly. The special plastic granulate for the UL94 V-0 housing is more expensive to manufacture. However, the extra cost is negligible compared to the damage that a battery fire could cause in a data centre.

The Yuasa SWL+2000 is a high-performance monobloc from the advanced SWL+ (Plus) series. With a nominal capacity of 57.6 Ah (often specified on a C10 or C20 basis, depending on the datasheet), this 12V battery offers outstanding energy density in a compact form factor.It represents the technological upgrade to classic battery models (such as the SWL1800 or NPL series). By optimising the internal plate structure and using the hybrid pure lead grid, the SWL+2000 delivers significantly higher discharge currents per cell, making it the ideal choice for modern, high-load UPS systems and critical emergency power supplies.Highlights at a glancePerformance increase (High Rate): The SWL+ series is specially designed to deliver extremely high amounts of energy in a short time (high wattage per cell). The SWL+2000 provides more power than standard AGM batteries of the same size, bridging critical seconds during mains switching.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years under optimum conditions). This ensures long-term planning certainty and significantly reduces replacement intervals in data centres.Specific capacity (57.6 Ah): With 57.6 Ah, this block closes the gap between the smaller 40Ah blocks and the large 70Ah models. It offers the perfect balance of capacity and footprint for medium-sized UPS cabinets.Advanced grid alloy: Thanks to the HT Element X or comparable hybrid alloys, internal corrosion is minimised and gas recombination is optimised. This ensures low self-discharge and high tolerance against "float charge" (continuous charging).VRLA-AGM technology: The electrolyte is completely bound in glass fibre fleece (AGM). The battery is leak-proof, maintenance-free (no refilling of water) and is equipped with safety valves for pressure regulation.Robust housing: Made from durable ABS plastic. (Note: When ordering, check whether you require the standard version or the FR version with flame-retardant UL94 V-0 housing).Areas of applicationThe SWL+2000 is primarily designed for standby applications with high power requirements:Uninterruptible power supply (UPS): Server rooms, IT infrastructure.Emergency lighting systems: According to VDE 0108 / EN 50171.Telecommunications: Buffering of transmission towers.Energy providers: Control technology in switchgear.Assembly & operationCharging voltage: In standby parallel operation (float), 2.275 V/cell (±1%) at 20°C are required. This corresponds to 13.65 V for the block.Tightening torque: The M6 terminal bolts should be tightened to approx. 4.8 Nm. Use insulated tools to avoid short circuits when mounting in the rack.Storage: Thanks to low self-discharge (<3% per month), the battery can be stored. Recharge should be carried out at the latest after 6 months to prevent sulphation. Features  ModelYuasa SWL+2000 (High Performance) Voltage12 V Capacity (C10)**57.6 Ah** (Nominal capacity at 10 hrs) Performance classHigh Rate Discharge (Optimised for UPS bridging) Technology**AGM VRLA** (Sealed, maintenance-free, recombination) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 229 x 138 x 207 (Typical size for 60Ah class) Connection**M6 female thread** (Female) Weight (kg)approx. 21.0 - 22.0 kg ApplicationMedium-sized UPS systems, emergency power supply  FAQs about the Yuasa SWL+2000What does "SWL+2000" mean? Is that the capacity?No. The number "2000" in the Yuasa nomenclature often refers to the power in watts per block (for a short discharge, e.g. 10 min). It indicates that this battery has a very high power density. The capacity is, as specified by you, 57.6 Ah.Does this battery replace the older SWL1800?Yes, often. The SWL1800 also had 57.6 Ah. The SWL+2000 is the modern upgrade with improved high current performance (hence the higher number 2000 vs. 1800) and often longer life (Plus series). The mechanical dimensions are usually compatible.Is the battery suitable for solar installations?Rather not. The SWL+ series is optimised for standby operation (continuous charging, seldom discharged with high current). For solar installations where the battery is charged and discharged daily (cyclical operation), batteries like the Yuasa NPC or REC series are much better suited.

The Yuasa SWL+2450 (in some markets or batches also listed as a variant of the SWL2500 family) is a high-performance energy storage battery from the modern SWL+ (Plus) series. With a nominal capacity of 80 Ah (often classified higher depending on the discharge rate), this 12-volt block offers an extremely high power density for critical industrial applications.It was specially developed to close the gap between the standard 75Ah batteries and the large 90Ah blocks or to replace older batteries with higher efficiency. Thanks to the Hybrid grid technology the SWL+2450 delivers maximum discharge currents (High Rate Discharge) and at the same time has a service life expectancy of 12+ years according to Eurobat standard.Highlights at a glanceEnormous power density (high rate): The "2450" (watt/block) rating indicates optimised high-current capability. Compared to standard batteries (such as the NPL series), this battery delivers up to 40% more energy, which makes it ideal for UPS systems that have to absorb high load peaks.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years under optimum conditions). This guarantees long-term operational reliability and minimises maintenance and replacement costs (TCO).Capacity 80 Ah: Offers a solid energy reserve of 80 Ah (with C10/C20 standard measurement). This makes the block ideal for medium to large UPS systems where a balance needs to be struck between runtime and space requirements.Maintenance-free AGM technology: VRLA design (valve regulated) with electrolyte bound in glass fibre. The battery is leak-proof, does not gas during normal operation (internal recombination) and can be installed flexibly (except permanently overhead).Robust hybrid plates: The use of a special lead-calcium-tin alloy reduces internal corrosion and self-discharge. The battery remains ready for use even after prolonged storage and can withstand float charges (Float Charge) for many years.Areas of applicationDue to the combination of high capacity and high current capability, the SWL+2450 is predestined for:Uninterruptible power supply (UPS/UPS): Data centres, server rooms.Telecommunications: Base stations, mobile radio containers.Emergency lighting: Centralised battery systems (ZSV).Starting applications: Emergency diesel (gensets), provided the cold test current is sufficient.Energy provider: Switchgear and control circuits.Assembly & operating instructionsTightening torque: The M6 terminal screws should be tightened with approx. 4.8 Nm. Check the torque after installation and during maintenance to avoid contact resistance.Charging voltage: For standby operation (trickle charge), a voltage of 2.275 V/cell (±1%) at 20°C is recommended. This corresponds to 13.65 V for the entire block.Temperature: The service life specification (12+ years) refers to an ambient temperature of 20°C. Higher temperatures shorten the service life chemically (rule of thumb: halving of the service life for every 10°C temperature increase).Installation: In battery cabinets or on racks. Ensure adequate ventilation in accordance with EN 50272-2. Features ModelYuasa SWL+2450 (High Rate Performance) Voltage12 V Capacity (Nominal)**Approx. 90.0 Ah** (C10) / **80.0 Ah** (High Rate Equivalent) Performance (10 min)**2450 - 2500 watts** per block (extreme power density) Technology**AGM VRLA** (sealed, recombination, maintenance-free) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 305 x 168 x 223 (typical "Group 31" / 100Ah size) Connection**M6 female thread** (Female) Weight (kg)approx. 30.0 - 32.0 kg ApplicationLarge UPS systems, server rooms, emergency power systems  FAQs for Yuasa SWL+2450What does the number "2450" mean?The number refers to the power output in watts per block (often with a 10-minute discharge up to 9.6V). It is used to differentiate the performance classes within the SWL series. An SWL2450 therefore supplies more current for a short time than an SWL2250, even if the Ah capacity may be similar.Can I mix this battery with an SWL2500?Better not. Although the values (80-90Ah) are close to each other, different internal resistances and ageing conditions can lead to uneven load distribution in the string. Never mix different types or batches within a string. Always replace the entire string or use exactly the same type.Is the battery suitable for horizontal installation?Yes. Thanks to the AGM technology (Absorbent Glass Mat), the acid is bound in the fleece. There is no free liquid. The battery can be operated upright or lying on its side (e.g. on a shelf). Only installation with the connections facing downwards (overhead) is not permitted.

The Yuasa SWL+2800-6 is an extremely powerful 6-volt monobloc from the High-Performance SWL+ series. In contrast to the widespread 12V batteries, this special block is used in large UPS systems where the highest capacities (184 Ah) and excellent thermal stability are required.The designation "2800" stands for the impressive performance output in watts per block. Due to the 6V architecture (only 3 massive cells instead of 6 smaller ones), this battery offers significantly higher resistance against thermal runaway and is therefore a robust alternative to 12V strings in critical large installations.Highlights at a glanceMassive 6V capacity (184 Ah): With 184 Ah (with C10) this block offers an enormous energy reserve. The 6V design allows the use of thicker lead plates, which increases cycle stability and lifespan compared to 12V solutions of equal capacity.SWL+ High Rate Power (2800 Watt): The SWL+ Series is optimised for high-current discharge. This block delivers extremely high currents for brief periods (high rate discharge), immediately intercepting voltage dips during mains failure – ideal for modern data centres.Robust 3-cell technology: Fewer cells mean fewer internal connectors and lower internal resistance. Heat dissipation is more efficient with 6V blocks, which significantly increases operational safety with high load currents.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life often up to 15 years). Thanks to the special lead-calcium-tin alloy of the SWL+ series, grid corrosion is minimised.Maintenance-free & flexible: Thanks to AGM technology (Absorbent Glass Mat) the electrolyte is bound. The battery is leak-proof, low-gassing (recombination >99%) and can be installed standing or lying down.Areas of applicationThe use of 6V blocks is typical for the high-performance sector:Large UPS systems: Where 12V blocks reach their thermal limits.Telecommunications: Central battery installations in switching centres.Emergency lighting: Security power supply in accordance with EN 50171.Energy storage: In industrial DC networks.Installation & safety instructionsAttention weight: At approx. 35 kg this 6V block is extremely heavy. Installation on shelves must be planned carefully (consider floor load).Connection: Due to the high currents M8 bolts are used. The tightening torque is approx. 6 Nm. Always use insulated tools.Series connection: 6V blocks are connected in series to achieve high system voltages (e.g. 400V). Never mix 6V and 12V blocks in one string!Charging voltage: The float charging voltage is 2.275 V/cell (±1%). For the 6V block this means 6.825 Volt total voltage.Features ModelYuasa SWL+2800-6 (High Rate Monoblock) Voltage**6 V** (3 large-volume cells) Capacity**184 Ah** (High Capacity) / Optimised for high current Technology**AGM VRLA** (Sealed, recombination) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 297 x 168 x 232 (typical 6V industrial size) Connection**M8 internal thread** (For heavy-duty cable connectors / copper bars) Weight (kg)approx. 33.0 - 35.0 kg (Very heavy!) Special featureIdeal for systems requiring high Ah values with a compact footprint  FAQs about the Yuasa SWL+2800-6Why use 6V blocks instead of 12V?With very large batteries (over 100 Ah), 12V blocks often become unmanageable and more thermally susceptible. 6V blocks provide the "sweet spot": they are more robust than 12V blocks, but easier to install than many individual 2V cells. They provide higher operational safety in large strings.What does the "2800" mean?The number refers to the performance in watts that the block can deliver during a short-term discharge (typically 10 minutes). For UPS engineers, this value is often more important than pure capacity (184 Ah) because it defines the maximum load the UPS can support.Is the thread M6 or M8?In this performance class (over 150 Ah), Yuasa almost always uses M8 internal thread to safely transfer the high currents and minimise connector resistance. M6 would be too weak here.

The Yuasa SWL+1950FR is the high-end solution for safety-critical UPS applications. It combines the increased power density of the SWL+ Series (74 Ah instead of the usual 65–70 Ah) with a flame-retardant housing of the highest fire protection class (UL94 V-0).This battery has been specially designed for environments where fire safety regulations (e.g. in public buildings, airports, or data centres) and maximum reliability (Very Long Life) must go hand in hand. Thanks to the patented HT Element X technology and hybrid pure lead plates, this 12V block achieves a service life of up to 15 years.Highlights at a glanceFR safety housing (Flame Retardant): The container and cover are made of flame-retardant ABS plastic as per UL94 V-0. The material self-extinguishes in the event of fire and prevents dripping—a mandatory requirement for many insurance companies in the data centre environment.SWL+ performance upgrade (74 Ah): With 74 Ah (C20), this block provides significantly more energy than standard batteries of the same size (like the SWL1850). You get more runtime from the same footprint.Eurobat "Very Long Life": Classified for a useful life of 12+ years (Design Life up to 15 years). This drastically reduces the TCO (Total Cost of Ownership), as replacement intervals are extended.HT Element X Alloy™: This exclusive lead alloy minimises internal corrosion and makes the battery more resistant to higher operating temperatures, which extends the real service life in switch cabinets.Hybrid pure lead technology: By reducing the internal resistance, the battery charges faster (Fast Recharge) and delivers higher discharge currents without voltage drop.Completely maintenance-free: VRLA-AGM technology with internal gas recombination (>99%). No water refilling, no leakage, no dangerous goods restrictions (according to IATA).Areas of applicationThe SWL+1950FR is the standard for critical infrastructure:High-end UPS systems: In banks, data centres and hospitals.Safety lighting: Central battery systems (CBS) according to EN 50171.Telecommunication: Transmission systems and switching nodes.Power supply: Switchgear and power control.Installation & safety instructionsTightening torque: The M6 terminal studs must be tightened to 4.8 Nm. A correct fit is essential at high currents (up to 800A short-circuit current) to prevent heat developing at the terminal.Installation position: The AGM technique allows operation standing upright or horizontal on the long side.Ventilation: Even with VRLA batteries, ventilation in accordance with EN 50272-2 must be ensured.Charging voltage: 2.275 V/cell ±1% at 20°C (equals 13.65 V block voltage). Features  ModelYuasa SWL+1950FR (Flame Retardant) Housing specification**Flame-retardant** according to UL94 V-0 (safety standard) Voltage12 V Capacity (C10)**74.0 Ah** (nominal capacity) Technology**AGM VRLA** (High Rate Plus – Optimised for UPS) Design Life**10 – 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 261 x 168 x 230 (standard size for medium UPS systems) Connection**M6 female thread** (Female Thread) Weight (kg)approx. 25.0 – 26.0 kg Field of applicationBanks, data centres, hospitals (emergency power supply)  FAQs about Yuasa SWL+1950FRWhat is the difference to the normal SWL1850?There are three main differences:Capacity: SWL+1950FR has 74 Ah, the SWL1850 has only approx. 66 Ah.Service life: SWL+ series lasts 12+ years, standard SWL lasts 10–12 years.Safety: The "FR" version always has the UL94 V-0 housing, the standard version often only UL94 HB.Why is "FR" (Flame Retardant) so important?In server rooms, the fire load density is extremely high. A battery fire could have catastrophic consequences. FR plastics prevent the battery itself from becoming an ignition source for the environment or propagating a fire. Many insurance companies require this explicitly.Can I use this battery as a replacement for a 65Ah battery?Yes, absolutely. Since the dimensions (350x166x174 mm) are standardised, the SWL+1950FR fits mechanically in the same space as an old 65Ah or 70Ah battery. Thus you get a performance upgrade (longer bridging time) without any conversion costs.

The Yuasa SWL+3000FR is the high-end safety variant of the powerful SWL+3000 monobloc. It combines the high capacity of 93.6 Ah with the extreme high-current capability of the SWL+ series and a housing of the highest fire protection class (UL94 V-0).This 12-volt battery is specially designed for critical large-scale systems (data centres, banks, hospitals), where not only reliability but also structural fire protection is subject to the strictest requirements. The "3000" denotes the enormous power output in watts that this block can provide at short notice.Highlights at a glanceFR safety housing (Flame Retardant): The case and lid are made from flame-retardant ABS plastic according to the UL94 V-0 standard. In the event of fire, the material self-extinguishes and prevents burning dripping – a mandatory requirement for insurance coverage in many server rooms.SWL+ High Rate Power (3000 Watt): The SWL+ series is optimised for maximum power density. This block delivers up to 40% more energy than standard batteries of the same size. It reliably absorbs the enormous load peaks of modern IT hardware during a power failure.Capacity 93.6 Ah: With 93.6 Ah (C10), the battery offers a very high energy density. It is perfect as a powerful upgrade for systems previously equipped with 90Ah batteries.Eurobat "Very Long Life": Classified for a service life of 12+ years (Design Life up to 15 years). This guarantees planning security and minimises total cost of ownership (TCO) thanks to long replacement intervals.HT Element X technology: The special hybrid alloy of the grid plates minimises internal corrosion and water loss. This makes the battery resistant to ageing, even with years of float charging.Maintenance-free & safe: VRLA-AGM technology (Absorbent Glass Mat). The electrolyte is bound in the mat, the battery is leak-proof, low-gassing and requires no topping up of water.Areas of applicationThe SWL+3000FR is the standard for safety-critical infrastructures:Data centres (Data Center): Maximum power with maximum fire protection.UPS systems (UPS): For medium to large systems with high load requirements.Emergency lighting: Central battery systems (ZSV) in accordance with EN 50171.Telecommunications: Switching centres and critical network nodes.Energy suppliers: Control technology and switchgear.Installation & safety instructionsObserve weight: With approx. 35 kg this block is very heavy. When fitting battery cabinets, use suitable lifting aids and take the rack's floor load into account.Terminal (M8): Due to the high currents (short circuit current >2000A) this block has large M8 terminals. The recommended tightening torque is approx. 6 Nm. Use insulated tools!FR requirement: Never mix FR batteries (grey/UL94 V-0) with standard batteries (black/HB) in the same string, as this will invalidate the fire protection certification for the whole system.Ventilation: Even with VRLA batteries, ventilation in accordance with EN 50272-2 must be ensured.Features ModelYuasa SWL+3000FR (Flame Retardant) Case specification**Flame retardant** according to UL94 V-0 (self-extinguishing) Voltage12 V Capacity (C10)**93.6 Ah** (High Rate Power Density) Power (10 min)approx. **3000 Watt** per block (peak-load optimised) Technology**AGM VRLA** (sealed, maintenance-free) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 305 x 168 x 223 (standard size for the 100Ah class) Connection**M6 female thread** (Female) Weight (kg)approx. 34.0 - 35.0 kg  FAQs about the Yuasa SWL+3000FRWhat is the difference to the normal SWL3000?Technically (electrically) they are identical. The difference is purely in the case material.SWL3000: Standard ABS plastic (burns slowly but burns).SWL3000FR: Flame-retardant plastic (UL94 V-0, self-extinguishing). In public buildings and data centres, the FR variant is usually mandatory.Why does this battery have M8 terminals and not M6?Above a certain power class (usually from 90Ah or very high discharge currents), the cross-section of M6 bolts is no longer sufficient to safely dissipate the heat generated under high current load. M8 offers a larger contact area and lower transfer resistance.Is the SWL+3000FR suitable as a replacement for 90Ah batteries?Yes, as a rule. The dimensions (approx. 305mm length) are an industry standard ("H6" case size similar). You can therefore often replace older 90Ah blocks on a 1:1 basis and benefit from an upgrade to 93.6 Ah as well as a higher power reserve.

The Yuasa SWL+2800-6FR is the high-end safety variant of the powerful 6-volt monoblock. It combines the massive capacity of 184 Ah with the extreme high current capability of the SWL+ series and a housing of the highest fire protection class (UL94 V-0).This battery is specially designed for Large UPS systems designed for use in sensitive areas (data centres, banks, hospitals) where, in addition to reliability, structural fire protection is a top priority. The 6V architecture provides a thermal robustness that is often superior to 12V batteries in this performance class.Highlights at a glanceFR safety housing (Flame Retardant): The housing is made of flame-retardant ABS plastic in accordance with the standard UL94 V-0. In the event of fire, the material extinguishes automatically. This is a mandatory requirement in many tenders for server rooms and public buildings in order to ensure insurance cover.Massive 6V capacity (184 Ah): With 184 Ah (C10), this block offers enormous energy reserves. The use of only 3 solid cells (instead of 6 small ones as with 12V) reduces the number of internal connectors and increases stability at high load currents.SWL+ High Rate Power (2800 Watt): The code "2800" stands for the optimised power output per block. This battery is designed to deliver extremely high currents for short periods in order to provide stable support for megawatt UPS systems during mains fluctuations.Eurobat "Very Long Life": Classified for a service life of 12+ years (Design Life up to 15 years). The HT Element X Alloy minimises corrosion and gassing, ensuring a long service life even under demanding conditions.Maintenance-free & Safe: Sealed VRLA construction with AGM technology. The battery does not gas during normal operation (recombination >99%), is leak-proof and requires no water maintenance.Areas of applicationThe SWL+2800-6FR is the standard for critical large-scale consumers:Data centres: Maximum power with maximum fire protection.Large UPS systems: Use in long strings (e.g. 400V DC) for high power.Telecommunication: Centralised power supply systems.Safety lighting: For very large centralised battery systems (ZSV).Energy provider: Robust buffering in power stations.Installation & safety instructionsNote weight: A single block weighs around 35kg. When installing in battery racks, always use lifting aids and work in pairs.Connection (M8): Due to the high currents (in some cases >1000A), these batteries have massive M8 bolt for use. The tightening torque is approx. 6 Nm. Use insulated tools!Installation position: Standing or lying on the long side possible.Mixed operation prohibited: Never mix FR batteries (grey/UL94 V-0) with standard batteries (black/HB) in one string, as this will invalidate the fire protection certification of the entire system. Features ModelYuasa SWL+2800-6FR (Flame Retardant) Housing specification**Flame retardant** according to UL94 V-0 (safety standard) Voltage**6V** (3 cells) Battery capacity**184 Ah** (High Capacity) / Optimised for discharge rates < 1 hr. Technology**AGM VRLA** (sealed, maintenance-free) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 297 x 168 x 232 (typical 6V size) Connection**M8 internal thread** (designed for high currents) Weight (kg)approx. 34.5 - 35.5 kg Field of applicationCentralised safety power supply, large UPS  FAQs about the Yuasa SWL+2800-6FRWhat is the advantage of 6V over 12V in this size?12V blocks with 180Ah would be extremely heavy and thermally difficult to control. The division into 6V blocks allows better thermal management and more robust plate connectors. In addition, the service life expectancy of 6V blocks in real operation is often more stable than that of high rate 12V blocks.How can I recognise the FR version?The "FR" in the model name and the imprint "UL94 V-0" on the casing cover are crucial. Yuasa often uses a grey casing for FR models, while standard models are often black (however, this can vary depending on the batch, the label counts).Will this battery fit in my old shelf for SWL2500-6?Normally yes. The dimensions (footprint approx. 297 x 203 mm) are an industry standard for this performance class. The SWL+2800-6FR offers more power for the same size and often a longer service life than older generations.

The Yuasa SWL+3500 is the flagship of the SWL-Plus series in the 12-volt segment. With an impressive nominal capacity of 110.2 Ah (C10) and an extreme power density, this block goes beyond the limits of conventional 100Ah batteries.Developed for high-end UPS systems, the SWL+3500 delivers maximum energy in the standard footprint of a 100Ah block. The code number "3500" stands for the enormous wattage that this battery can provide with short discharge times. In combination with the Eurobat "Very Long Life" Classification (12+ years), this is the ultimate solution for data centres that require maximum autonomy time and maximum operational reliability.Highlights at a glanceMaximum capacity (110.2 Ah): With over 110 Ah this block offers approx. 10% more energy than standard 100Ah class batteries. This means longer bridging times without taking up additional space in the battery cabinet.SWL+ High Rate Performance (3500 Watt): The battery is optimised for high-current discharges. It delivers extremely high currents for short periods in order to supply even the most powerful server racks with a stable power supply in the event of a mains failure (high watt/cell density).Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This guarantees long-term planning security and massively reduces the total cost of ownership (TCO).HT Element X technology: The advanced hybrid alloy of the grid plates minimises internal corrosion and water loss. This makes the battery extremely resistant to ageing, even with long-term charge retention.Maintenance-free & leak-proof: VRLA-AGM technology (Absorbent Glass Mat). The electrolyte is bound in the fleece. The battery is sealed, has low gassing (recombination >99%) and does not require topping up with water.Robust housing: Made of resistant ABS plastic (usually also available as FR version with UL94 V-0).Areas of applicationThe SWL+3500 is designed for applications that do not tolerate compromises:Large UPS systems (data centre): Maximum power in minimum space.Telecommunications: Buffering of main distributors and mains nodes.Energy provider: Control technology in power plants.Emergency lighting: Large centralised battery systems (ZSV).Industry: DC supply systems and switchgear.Installation & safety instructionsWeight warning: A single block weighs almost 40 kg. Handling must be carried out with lifting aids or in pairs. Check the load capacity of your raised floor or shelving system.Connection (M8): Due to the enormous currents (short-circuit current >2500A), the M8 connections installed. The recommended tightening torque is approx. 6 Nm. Loose connections can immediately lead to arcing at this power.Ventilation: Battery compartments must be ventilated in accordance with EN 50272-2.Charging voltage: 2.275 V/cell ±1% at 20°C (corresponds to 13.65 V block voltage).Features ModelYuasa SWL+3500 (Maximum Power) Voltage12 V Capacity (C10)**110.2 Ah** (Highest density of the SWL series) Performance (10 min)approx. **3500 watts** per block (High Rate Discharge) Technology**AGM VRLA** (Sealed, maintenance-free) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 268 x 173 x 202 (compact for this power class) Connection**M8 internal thread** (designed for high currents) Weight (kg)approx. 34.5 - 36.0 kg Special featureOffers more power than some 120Ah standard blocks  FAQs for Yuasa SWL+3500Will the SWL+3500 fit where the SWL3300 used to be?Yes. The dimensions (footprint approx. 305 x 168 mm) are generally identical. You can use the SWL+3500 as a power upgrade. You get more capacity (110Ah vs ~100Ah) and a higher current carrying capacity with the same space requirement.Is the battery suitable for solar storage?Rather not. Like all batteries in the SWL series, the SWL+3500 is a pure standby battery (UPS). It is designed to last for years when fully charged and then deliver plenty of power once. It is not economical for the daily cycle operation (charging/discharging) of a PV system. For this purpose, batteries from Yuasa REC or SLE series are recommended.Is the battery also available in a flame-retardant version?Yes. The version SWL+3500FR has a housing in accordance with UL94 V-0. For batteries in this power class, the FR version is almost exclusively required in commercial tenders. Please check this when placing your order.

The Yuasa SWL+2450FR is the safety-optimised version of the SWL+ high-performance block with a capacity of 80 Ah. It combines the extreme power density of the "High Rate" technology with a housing of the highest fire protection class (UL94 V-0).This 12-volt block has been specially developed for critical infrastructures (data centres, banks, hospitals) where fire protection regulations must be strictly observed. The SWL+2450FR supplies extremely high currents for short periods of time (hence the "2450" for the watt output) and at the same time offers an excellent service life expectation of 12+ years (Very Long Life).Highlights at a glanceFR safety housing (Flame Retardant): The container and lid are made of flame-retardant ABS plastic in accordance with the standard UL94 V-0. The material self-extinguishes in the event of fire and prevents flaming dripping – a must for insurance protection in many server rooms.SWL+ High Rate Performance: The designation "2450" stands for the optimised power output (watts per block). Compared to standard batteries with 80 Ah, this block can deliver significantly more energy for a short time to reliably absorb voltage peaks during a power failure.Capacity 80 Ah: With 80 Ah (nominal value), the battery offers a solid energy reserve. It closes the gap between 75Ah and 90Ah blocks and offers an optimal balance between runtime and footprint.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This ensures planning reliability and low operating costs (TCO) over the entire service life of the system.Maintenance-free & leak-proof: Thanks to the latest VRLA-AGM technology the electrolyte is bound in the glass mat. The battery is sealed, does not gas under normal operation, and does not require topping up with water.HT Element X technology: The special alloy of the grid plates minimises internal corrosion and makes the battery more resistant to ageing, even during continuous float charge operation.Areas of applicationThe SWL+2450FR is the standard for large, safety-critical systems:Data centres (Data Center): Maximum power with maximum fire protection.UPS systems (UPS): Ideal for systems with short to medium bridging times at high load.Safety lighting: Central battery systems (ZSV) according to VDE 0108 / EN 50171.Telecommunications: Switching centres and critical network nodes.Energy supplier: Control technology and switchgear.Installation & safety instructionsNote weight: With approximately 25 kg the block is heavy. When populating battery cabinets, use suitable lifting aids and pay attention to the floor load of the rack.Tightening torque: The M6 terminal bolts must be tightened to 4.8 Nm. A correct fit is essential to avoid transition resistance and heat build-up.Installation position: Standing or lying on the long side possible (not upside down).Ventilation: Battery rooms must be ventilated in accordance with EN 50272-2 to remove hydrogen that may be generated in the event of a fault (overcharging). Features ModelYuasa SWL+2450FR (Flame Retardant) Housing specification**Flame-retardant** according to UL94 V-0 (self-extinguishing) Voltage12 V Capacity**approx. 90.0 Ah** (C10) / High Rate Performance > 2450W/block Technology**AGM VRLA** (sealed, maintenance-free) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 305 x 168 x 223 (standard size for large UPS blocks) Connection**M6 female thread** (female) Weight (kg)approx. 32.0 kg Field of applicationLarge-scale UPS, telecommunications, energy suppliers  FAQs about the Yuasa SWL+2450FRWhat is the difference between 80 Ah and "2450"?This is the difference between energy and power:80 Ah (energy): How long the battery lasts at low current (tank capacity).2450 (power): How much power (watts) the battery can immediately and briefly deliver (engine output). For UPS systems, the value "2450" is often more important than the pure Ah, as the battery has to supply an extremely high current within a few minutes.How can I recognise the FR version?The "FR" in the name and the inscription "UL94 V-0" on the housing are decisive. Visually, FR housings from Yuasa are often grey (standard is often black), but always rely on the nameplate. In public buildings, FR is often compulsory.Can I use the SWL+2450FR as a replacement for a 75Ah battery?Yes. The dimensions (approx. 350mm length) are usually identical to the standard 75Ah blocks (e.g. NPL78-12). By replacing, you get an upgrade to 80 Ah and higher high-current capacity without having to modify the cabinet.

The Yuasa SWL+3000 is an absolute powerhouse within the SWL+ Series. With a specific nominal capacity of 93.6 Ah (often also listed in the 90-100Ah class) and extreme power output, this 12-volt unit redefines the standard for high-performance UPS systems.It was developed to provide maximum amounts of energy in a compact footprint. The figure "3000" stands for the impressive wattage per unit. Thanks to the Eurobat "Very Long Life" classification (12+ years), it is the preferred choice for operators of critical infrastructures who do not want to compromise on availability.Highlights at a glanceExtreme power density (3000 Watt): The SWL+3000 is optimised for high current discharges. It delivers up to 40% more power than conventional batteries of comparable size. This is crucial to be able to supply powerful server racks without voltage drop in the event of a mains failure.High capacity (93.6 Ah): With 93.6 Ah the battery offers a solid balance between high peak load capability and long bridging time. It is ideally suited as a replacement for older 90Ah or 100Ah batteries.Eurobat "Very Long Life": Designed for a lifetime of 12+ years (design life up to 15 years). This minimises operating costs (TCO), as replacement intervals can be significantly extended.Robust construction: The hybrid grid technology (lead-calcium-tin) minimises corrosion. The battery is resistant to ageing, even with continuous trickle charging (float charge).Maintenance-free & leak-proof: VRLA-AGM technology (Absorbent Glass Mat). The electrolyte is bound in the fleece, which makes the battery leak-proof (not considered dangerous goods according to IATA) and eliminates the need for water maintenance.Areas of applicationThe SWL+3000 is designed for applications with the highest energy requirements:UPS systems (data centre): Critical supply of IT infrastructure.Telecommunication: Buffering of grid nodes and transmitters.Energy suppliers: Control systems in power stations.Emergency lighting: Large centralised battery installations (ZSV).Starting applications: Emergency generators (gensets).Installation & safety instructionsWeight: With over 33 kg this unit is very heavy ("Two-Person-Lift"). Use lifting aids when installing in racks.Connection (M8): Due to the high currents, the SWL+3000 usually has M8 connectors. The recommended torque is approx. 6 Nm. Check this before installation, as smaller models often have M6 terminals.Ventilation: Ensure adequate ventilation in the battery room in accordance with EN 50272-2.Charge voltage: 2.275 V/cell ±1% at 20°C (corresponds to 13.65 V unit voltage). Features ModelYuasa SWL+3000 (High Rate Power) Design**Top Terminal** (classic block battery) Voltage12 V Capacity (C10)**93.6 Ah** (High Capacity) Performance (10 min)approx. **3000 Watt** per unit (Extremely high discharge rate) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 305 x 168 x 223 (Compact size for the ~100Ah class) Connection**M6 female thread** (Female) Weight (kg)approx. 33.0 - 35.0 kg Field of applicationHigh-performance UPS systems, emergency lighting systems (central battery)  FAQs for Yuasa SWL+3000What is the difference between SWL3000 and SWL3300?Both batteries have similar dimensions, but different performance data.SWL3000: Optimised for approx. 3000 Watt / 93.6 Ah.SWL3300: The even more powerful model with approx. 3300 Watt / ~100 Ah. Please check your data sheet and the requirements of your UPS. They are often mechanically interchangeable, but dimensioned differently electrically.Is the SWL+3000 also available in FR (flame retardant)?Yes. For data centres and public buildings, the SWL+3000FR (with UL94 V-0 housing) is available and highly recommended. Almost only FR types are installed by default in this power segment.Can I install this battery horizontally?Yes. Thanks to AGM technology, the electrolyte is bound. Mounting on the longitudinal side is common to increase packing density in racks. Ensure that the terminals do not point permanently downwards (overhead mounting is prohibited).

The Yuasa SWL+3500FR is the high-end safety version of the most powerful 12V block in the SWL family. It combines the massive capacity of 110.2 Ah with the extreme high-current capability of the SWL+ series and a housing with the highest fire protection class (UL94 V-0).This battery is the ultimate for large UPS systems in critical infrastructures (data centres, banks, hospitals). It offers maximum energy density in a standard footprint and at the same time fulfils the strictest safety requirements with regard to structural fire protection. With a service life of 12+ years the SWL+3500FR is the first choice for system operators who demand maximum availability and safety.Highlights at a glanceFR safety housing (Flame Retardant): The housing and cover are made of flame-retardant ABS plastic in accordance with the standard UL94 V-0. In the event of fire, the material extinguishes automatically and prevents burning dripping – a mandatory requirement for insurance coverage in many server rooms.Maximum capacity (110.2 Ah): With over 110 Ah (C10) this block offers approx. 10% more energy than standard batteries in the 100Ah class. You maximise the autonomy time of your UPS without having to enlarge the battery cabinet.SWL+ High Rate Performance (3500 Watt): The code "3500" stands for the enormous power output (watts per block). This battery is optimised to deliver extremely high currents for short periods in order to stably support megawatt loads in the event of a power failure.Eurobat "Very Long Life": Classified for a service life of 12+ years (Design Life up to 15 years). This drastically minimises total cost of ownership (TCO) due to less frequent replacement cycles.HT Element X technology: The special hybrid alloy of the grid plates minimises internal corrosion and water loss. This makes the battery extremely resistant to ageing, even with years of float charging.Maintenance-free & safe: VRLA-AGM technology (Absorbent Glass Mat). The electrolyte is immobilised in the mat, the battery is leak-proof, has low gassing, and does not require water replenishment.Areas of applicationThe SWL+3500FR is the standard for large safety-critical systems:Data centres (Data Center): Maximum power with maximum fire protection.UPS systems (UPS): For high-power systems with high load requirements.Safety lighting: Large central battery systems (ZSV) in accordance with EN 50171.Telecommunications: Switching centres and critical network nodes.Energy suppliers: Control technology and switchgear.Installation & Safety InstructionsNote weight: With almost 40 kg this block is extremely heavy. Populating battery cabinets must be carried out using lifting aids or by two people.Connection (M8): Due to the enormous currents (short-circuit current >2500A), this block features large M8 terminals. The recommended tightening torque is about 6 Nm. Use insulated tools!FR obligation: Never mix FR batteries (grey/UL94 V-0) with standard batteries (black/HB) in one string, as this will void the fire protection certification of the whole installation.Ventilation: Even with VRLA batteries, ventilation must be provided in accordance with EN 50272-2.Features ModelYuasa SWL+3500FR (Flame Retardant) Housing specification**Flame retardant** according to UL94 V-0 (Highest safety level) Voltage12 V Capacity (C10)**110.2 Ah** (Maximum Power Density) Performance (10 min)approx. **3500 Watt** per block Technology**AGM VRLA** (Sealed, maintenance-free) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 268 x 173 x 202 (Compact size for >100Ah) Connection**M8 female thread** (Female, for high currents) Weight (kg)approx. 36.0 kg  FAQs on the Yuasa SWL+3500FRWhat is the difference to the normal SWL3500?Technically (electrically) they are identical. The difference lies purely in the case material.SWL3500: Standard ABS plastic (burns slowly, but burns).SWL3500FR: Flame-retardant plastic (UL94 V-0, self-extinguishing). For public buildings and data centres the FR variant is usually mandatory.Can I use this battery as a replacement for a 100Ah battery?Yes, this is a perfect upgrade. The dimensions (approx. 305mm length) correspond to the industry standard for 100Ah blocks. By swapping to the SWL+3500FR you get 110.2 Ah (+10% capacity), a massively higher high-current output and the safety of the FR housing without having to rebuild the cabinet.Why does this battery have M8 terminals?With outputs of over 3500 watts per block, extremely high currents flow during discharge. Smaller terminals (M6) would heat up excessively and provide too much contact resistance. M8 guarantees safe and low-loss current transmission.

The Yuasa SWL+4000 is the absolute top model of the SWL-Plus series in the 12-volt segment. With a massive nominal capacity of 135 Ah and outstanding power density, this block defines the upper limit of what is possible with VRLA technology in this size.This battery was designed for large-scale consumers who need maximum energy (both capacity and high current). It is the more powerful upgrade to the well-known models of the 120Ah class (such as the SWL3800). With the Eurobat "Very Long Life" classification, the SWL+4000 is the backbone for megawatt UPS systems in hyperscale data centres and critical industrial facilities.Highlights at a GlanceMaximum capacity (135 Ah): With 135 Ah this block offers enormous reserves for long backup times. It enables the realisation of long autonomy times without resorting to complex 2V cell systems.Ultra High Rate Performance (4000 Watt): The figure "4000" signals the extreme output in watts per block. The SWL+4000 is designed to reliably manage enormous inrush currents and load peaks of modern IT hardware.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This ensures investment security and minimises maintenance cycles throughout the entire service life of the system.HT Element X Technology: The patented alloy of the grid plates minimises internal corrosion. This is particularly important for batteries of this size in order to guarantee uniform ageing of all cells in the block.Maintenance-free & Robust: VRLA-AGM technology (Absorbent Glass Mat). The electrolyte is bound, the battery is leak-proof and low-gassing. The housing is extremely robust to safely support the high weight of the plates.Compact Powerhouse: Despite the high performance, the battery uses a standardised housing size, which often makes it possible to replace in existing systems without requiring rack modification.Areas of ApplicationThe SWL+4000 is predestined for heavy-duty applications:Large UPS systems: Data centres, banks, insurance companies.Telecommunications: Central switching centres (Core Network).Energy suppliers: Buffering in power stations and substations.Industry: Emergency power supply for production lines.Central battery systems: For emergency lighting for large building complexes.Installation & Safety InstructionsCritical weight: A single block weighs just under 50 kg. Handling must never be carried out alone. Use mechanical lifting aids or always work in a team (observe occupational safety!).Floor load: Before installation, check the point load of your raised floor or the load-bearing capacity of the shelves. A fully equipped cabinet quickly reaches a weight of over a tonne.Connection (M8): Here, currents of several thousand amperes can flow in the event of a short circuit. The M8 bolts must always be tightened to 6 Nm.Ventilation: Sufficient ventilation of the battery room in accordance with EN 50272-2 is mandatory. Features  ModelYuasa SWL+4000 (Ultra High Performance) Voltage12 V Capacity**135.0 Ah** (up to 140 Ah depending on rate C10/C20) Performance Class**~4000 Watt** per block (extreme energy density) Technology**AGM VRLA** (sealed, maintenance-free) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 341 x 173 x 281 (Very large and high!) Connection**M8 internal thread** (massive terminals for high current) Weight (kg)approx. **47.0 - 49.0 kg** (heavy duty) ApplicationCentral large UPS, backup power systems, industry  FAQs on Yuasa SWL+4000Can I use the SWL+4000 as a replacement for the SWL3800?Yes. The SWL+4000 is the direct power upgrade to the SWL3800. The dimensions (footprint approx. 340 x 173 mm) are generally compatible. By replacing you gain in capacity and maximum discharge power.Do I need special connection cables because of this weight?Not because of the weight, but because of the power. Enormous currents flow at 4000 watts per block. You need connectors with a sufficient cross-section (often 50mm² or 70mm² and more, depending on the string length), to avoid voltage drops and overheating. Only use certified jumpers.Is the SWL+4000 also available in FR (flame retardant)?Yes. The version SWL+4000FR with UL94 V-0 housing is available and is the standard for use in data centres. Please state when ordering if you require the FR version.

The Yuasa SWL+2900-12FT is a highly specialised VRLA battery in the Front Terminal design (FT). With a nominal capacity of 96.8 Ah (often classified as 100Ah class) and the proven SWL+ high current technology, this battery has been specifically developed for telecommunications applications and 19-inch UPS cabinets designed.The "FT" in the name stands for the front-mounted terminals. This allows extremely simple installation and maintenance in tight rack systems, as no dangerous work is required above the batteries. Combined with a life expectancy of 12+ years (Very Long Life) this is the ideal solution for space-critical data centres and network nodes.Highlights at a glanceFront Terminal design (FT): The terminals are located on the front of the slim block. This enables quick installation and voltage measurement directly from the front, without having to pull the batteries out of the rack.Optimised for 19" & 23" cabinets: The design is long and narrow. As a result, for example, four of these blocks fit perfectly side by side in a standard level of a 19-inch server cabinet or ETSI rack.High energy density (96.8 Ah): Despite its compact footprint, the block offers almost 100 Ah capacity. It is ideal for long bridging times in telecommunications or short high-current phases in the UPS.Central degassing possible: The FT series usually has connections for hoses for central degassing. This allows any escaping gases to be specifically directed out of the closed cabinet.Eurobat "Very Long Life": Classified for 12+ years. The SWL+ technology uses improved grid alloys to minimise corrosion and maximise service life even with fluctuating temperatures (typical for outdoor telecom cabinets).Maintenance-free: VRLA-AGM technology (Absorbent Glass Mat). No water topping up needed, leak-proof and vibration-resistant.Areas of applicationThe SWL+2900-12FT dominates wherever space is money and maintenance needs to be quick:Telecommunications: Base stations (BTS), outdoor enclosures, switching centres.UPS systems (rackmount): In server rooms, where batteries are installed directly in the IT rack.Renewable energies: Buffer storage in compact control cabinets.Railway technology: Signal systems (thanks to vibration resistance and compactness).Assembly & Maintenance (Front Terminal Advantages)Simple voltage measurement: As the terminals are at the front, a technician can check the block voltages (SOH check) in seconds by simply opening the rack door.Safe installation: There is no need to reach over the terminals with tools (minimising risk of short circuits).Torque: The M8 front terminals should be tightened with the prescribed torque (usually approx. 6 Nm) as specified.Monobloc connectors: Rigid copper connectors or short flexible bridges are often provided/required to interconnect the blocks side by side.Features ModelYuasa SWL+2900-12FT (Front Terminal) Design**Front Terminal** (connections at the front) Voltage12 V Capacity (Nominal)**96.8 Ah** (C10) / approx. **100 - 103 Ah** (C20) Performance (10 min)High rate performance (optimised for short bridging times) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 395 x 108 x 287 (long and narrow for racks) Connection**M8 internal thread** (accessible from the front) Weight (kg)approx. 33.0 - 34.0 kg Application19" / 23" cabinets, telecommunications (BTS), UPS  FAQs about the Yuasa SWL+2900-12FTWhat is the difference to a normal SWL2900?The difference lies purely in the design.Standard (Top Terminal): Terminals are located on top of the lid. The block is rather cubic (wider).FT (Front Terminal): Terminals are at the front. The block is very slim ("shoebox" design) and deep. Electrically the performance data is nearly identical, but the FT version is essential for 19-inch cabinets.Can I install the battery horizontally?Theoretically yes, but usually not necessary. The FT design is designed to be upright (standing on the floor) pushed into rack levels. This makes optimal use of space. Horizontal installation is possible thanks to AGM, but with this specific housing design rarely offers advantages.Do I need a special rack?Yes, or a suitable cabinet. The batteries are approx. 40 cm deep. Your rack or cabinet must accommodate this depth and the corresponding load (approx. 150 kg per level with 4 blocks). Standard network cabinets are ideal for this.

The Yuasa SWL+4000FR is the ultimate energy solution for high-security areas. It combines the massive capacity of 135 Ah and the extreme power density of the SWL-Plus top models with a housing of the highest fire protection class (UL94 V-0).This 12-volt block was developed for use in hyperscale data centres and critical industrial facilities, where two factors are non-negotiable: Maximum availability (performance) and maximum building protection (safety). With a unit weight of almost 50 kg, this battery is a pure powerhouse that supports megawatt loads and is designed for a service life of 12+ years.Highlights at a glanceFR safety housing (Flame Retardant): The housing is made of flame-retardant ABS plastic in accordance with standard UL94 V-0. In the event of fire, the material self-extinguishes and prevents flaming dripping. This is often the basic prerequisite for insurance cover in server rooms and public facilities.Maximum capacity (135 Ah): With 135 Ah this block offers enormous energy reserves. It enables long autonomy times in UPS systems, without the need for complex and maintenance-intensive 2-volt cell systems.Ultra High Rate Performance (4000 Watt): The indicator "4000" stands for the extreme wattage per block. The SWL+4000FR is designed to safely handle the enormous inrush currents and load peaks of modern IT infrastructure.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This guarantees investment security and minimises maintenance costs for more than a decade.HT Element X technology: The patented hybrid alloy of the grid plates minimises internal corrosion and makes the massive block resistant to uneven ageing and temperature fluctuations.Maintenance-free & Safe: VRLA-AGM technology (Absorbent Glass Mat). The electrolyte is bound, the battery is leak-proof, low-gassing (internal recombination) and does not require topping up with water.Areas of applicationThe SWL+4000FR is the standard choice for heavy-duty applications in sensitive areas:Data centres (Data Center): Maximum power with maximum fire protection.Large UPS systems: Banks, insurance companies, hosting providers.Telecommunication: Central switching stations (Core Network).Energy suppliers: Buffering in power stations and substations.Safety lighting: Large central battery systems (ZSV).Installation & safety instructionsCritical weight: A single block weighs almost 50 kg. Installation must never be carried out alone ("two-person lift" or lifting equipment). Pay strict attention to the point load of your raised floor in the data centre!Connection (M8): In the event of a short circuit, currents of several thousand amperes flow here. The M8 bolts must be tightened to 6 Nm. A loose contact can immediately lead to massive heat generation at this power.FR compliance: Never replace an FR block with a standard block, as this downgrades the fire protection class of the entire string ("chain").Ventilation: Adequate ventilation of the battery room in accordance with EN 50272-2 is mandatory.Features  ModelYuasa SWL+4000FR (Flame Retardant) Housing Specification**Flame retardant** according to UL94 V-0 (Highest safety standard) Voltage12 V Capacity**135.0 Ah** (Ultra High Capacity) PerformanceMaximum performance for 12V monoblocks Technology**AGM VRLA** (Sealed, Maintenance-free, FR Case) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 341 x 173 x 281 (Massive block!) Connection**M8 internal thread** (Female) Weight (kg)approx. **49.0 kg**  FAQs on Yuasa SWL+4000FRWhat is the difference to the standard SWL4000?Technically (electrically) they are identical. The difference is in the housing material.SWL4000: Standard ABS (UL94 HB).SWL4000FR: Flame retardant (UL94 V-0). The extra charge for the FR version is an investment in safety and often a requirement of building insurance.Do I need special tools for installation?You will definitely need insulated tools (torque wrench, spanner). With batteries of this size, a short circuit is extremely dangerous (arc, molten metal). Due to the M8 connection you need suitable sockets/spanner sizes.How many of these batteries fit in a cabinet?That depends on the statics. Because of the high weight (~48 kg) and height (275 mm), fewer blocks usually fit in a standard cabinet than in smaller types. Reinforced heavy-duty shelves or special battery cabinets are often required. Be sure to check the floor load (kg/m²). 

The Yuasa SWL+4300 marks the absolute peak of performance in the field of industrial 12V monoblocks. With a capacity of 140Ah (often rated up to 150Ah at C20) and an enormous power density, it is the most powerful model of the SWL-Plus series.This battery is designed for applications where maximum energy density is required in a limited space. It not only delivers extremely high discharge currents (high rate), but also offers maximum autonomy times. With its Eurobat "Very Long Life" classification, the SWL+4300 is the premium solution for megawatt UPS systems and critical power grids that need to run reliably for over a decade.Highlights at a glancePeak Performance (4300 Watt): The figure "4300" refers to the maximum power output (watts per block). This is one of the highest values technically achievable in a 12V AGM housing. It handles even the most aggressive load jumps of modern cloud servers.Maximum Capacity (140Ah+): While many batteries of this form factor end at 120-135Ah, the SWL+4300 delivers a true 140Ah (or up to 150Ah at C20). This means maximum backup time without increasing the footprint.Eurobat "Very Long Life": Classified for a service life of 12+ years (Design Life 15 years). This significantly reduces the replacement effort and associated logistics costs (an important factor at this weight).HT Element X Technology: The advanced hybrid alloy of the grids minimises internal corrosion and prevents premature ageing due to drying out or thermal stress.Maintenance-free & Robust: VRLA-AGM technology (Absorbent Glass Mat). The electrolyte is bound, and the housing is reinforced to safely hold the heavy weight of the massive lead plates.High cycle resistance in standby: Even with frequent short discharges or unstable grids, the SWL+4300 is considerably more robust than standard UPS batteries.Areas of applicationThe SWL+4300 is the first choice for "mission critical" applications:Hyperscale Data Centre: Where every square metre of floor space is extremely expensive and maximum kW output is required.Large UPS Systems: In banks, hospitals and industrial operations.Telecommunication: Central network nodes with high power demands.Utility Providers: Peak load coverage and switchgear control.Emergency power systems: Starter battery for large diesel engines (gensets) or turbines.Installation & Safety InstructionsWarning: High weight: A single block weighs around 50 kg. This is well above manual handling limits. Always use lifting equipment or work in a team. Check the floor load (kg/m²) in the server room!Connection (M8): Due to the extreme currents (short-circuit current >3000A), M8 bolts are installed. These must be tightened to 6 Nm. Use insulated tools to avoid life-threatening electric arcs.Wiring: Use connectors with a sufficient cross-section (at least 70mm² or copper rails) for lossless transfer of the 4300-watt output.Cooling: Densely packed high-performance batteries generate heat. Ensure spacing between the blocks (approx. 10mm) for air circulation.Features  ModelYuasa SWL+4300 (Max Performance) Voltage12 V Capacity**140.0 Ah** (C10) / **150.0 Ah** (C20) Performance (10 min)approx. **4300 Watt** per block (peak value of the series) Technology**AGM VRLA** (Sealed, Maintenance-free) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 341 x 173 x 281 (identical footprint to the SWL4000) Connection**M8 internal thread** (Female) Weight (kg)approx. **51.0 - 52.5 kg** (Extremely heavy!) Application areaMaximum performance UPS, critical infrastructure  FAQs about the Yuasa SWL+4300What is the difference to the SWL4000?The SWL+4300 is the high-end advancement. With identical or very similar dimensions, denser plate packing and optimised grids increase power from 4000 to 4300 watts. It maximises the physical potential of the housing volume.Can this battery still be installed by hand?Only to a limited extent. Sliding 50 kg onto a lower shelf is possible but not ergonomic. On upper levels of a battery cabinet, this block should only be lifted with a battery lift. Health and safety regulations often prohibit manual lifting of such loads.Is the SWL+4300 compatible with older SWL3800?Mechanically yes, electrically no. It fits the same space (footprint), but has significantly more capacity and performance. Never mix SWL3800 and SWL+4300 in one string. If replacing the entire system, the SWL+4300 is an excellent upgrade for longer runtime.

The Yuasa SWL+4300FR is the ultimate combination of maximum performance and maximum safety. It is the flagship of the SWL-Plus series and combines an enormous capacity of 140 Ah (up to 150Ah C20) with a housing of the highest fire protection class (UL94 V-0).This almost 50 kg 12V block was developed for hyperscale data centres and critical industrial facilities where no compromises can be made. It delivers the highest possible energy density on this footprint while meeting the strictest structural fire protection requirements. With a design life of 12+ years the SWL+4300FR is the foundation for high-availability power supply systems.Highlights at a glanceFR safety housing (Flame Retardant): Housing and cover are made of flame-retardant ABS plastic according to the UL94 V-0 standard. In the event of fire, the material extinguishes itself. This is often a mandatory requirement for insurance cover in data centres, banks and public buildings.Maximum power density (4300 watts): The figure "4300" marks the current technical maximum output (watts per block) in this size. The battery manages even the most extreme load transients and inrush currents of modern IT infrastructure with ease.Enormous capacity (140 Ah): With 140 Ah (C10), this block offers maximum reserves. It provides long autonomy times without the need to resort to high-maintenance wet cells or complex 2-volt systems.Eurobat "Very Long Life": Classified for a service life of 12+ years (design life up to 15 years). This guarantees investment security and minimises the logistical effort for replacement (which is a significant cost factor at this weight).HT Element X technology: The special hybrid alloy of the grid plates minimises internal corrosion and makes the massive block resistant to thermal stress and ageing.Maintenance-free & safe: VRLA-AGM technology (Absorbent Glass Mat). The electrolyte is bound, the battery is leak-proof, low-gassing and vibration-resistant.Areas of applicationThe SWL+4300FR is the standard choice for "mission critical" applications in sensitive fields:High-end data centres: Where maximum kW performance and fire protection requirements (V-0) coincide.Large UPS systems: For safeguarding entire building complexes or production lines.Energy suppliers: Control technology in power plants and substations.Telecommunications: Core network nodes.Emergency lighting: Large central battery systems (ZSV).Installation & safety instructionsCritical weight: A single block weighs around 50 kg. Installation must never be carried out manually by a single person. Use lifting equipment (battery lifts) and always check the floor load capacity (kg/m²) in the server room.Connection (M8): Currents of more than 3000 amps can flow here in the event of a short circuit. The M8 bolts must always be tightened to 6 Nm. A loose connection will immediately cause dangerous heat to develop at this power level.FR compliance: Never replace a defective block in an existing FR string with a standard version (black/HB), as this cancels out the fire protection class of the entire system.Cooling: Ensure that there is approximately 10mm space between the blocks for air circulation, to prevent heat build-up inside the block. Features  ModelYuasa SWL+4300FR (Flame Retardant) Housing Specification**Flame-retardant** to UL94 V-0 (self-extinguishing) Voltage12 V Capacity**140.0 Ah** (C10) / **150.0 Ah** (C20) - The maximum Performance (10 min)approx. **4300 Watts** per block (Extreme energy density) Technology**AGM VRLA** (Sealed, maintenance-free, FR case) Design Life**10 - 12 years** (EUROBAT: Long Life) Dimensions (L x W x H in mm)approx. 341 x 173 x 281 (Identical to SWL4000) Connection**M8 female thread** (Female) Weight (kg)approx. **52.5 kg** (Extremely heavy!)  FAQs about the Yuasa SWL+4300FRWhat is the difference compared to the standard SWL+4300?The difference is solely in the case material.SWL+4300: Standard ABS (UL94 HB).SWL+4300FR: Flame-retardant (UL94 V-0). Technically, both deliver the same enormous performance. However, the FR version is required in most commercial tenders (especially data centres).Will this battery fit in my old cabinet for 120Ah batteries?Be careful with the weight. The dimensions (footprint) are often similar to 120Ah blocks (e.g. SWL3800). But the SWL+4300FR is significantly heavier (~50kg vs. ~40kg). Be sure to check if your cabinet shelves can support this additional weight before you upgrade.Why M8 connections?With a discharge capacity of 4300 watts per block, currents are so high that an M6 thread would become too hot. M8 offers more contact area and safety for the transmission of these enormous amounts of energy.