Yuasa SWL+800FR Industrial VRLA Battery - 12V / 25Ah (Flame Retardant / High Performance)

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 glance

• FR 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 application

The 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 & advantages

The SWL+800FR differs significantly from standard batteries thanks to its internal construction:

1. 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.
2. 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.
3. 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 instructions

• Connection: 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

FAQs about the Yuasa SWL+800FR

Is 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?