OPTIMA YellowTop YT S 2.1 AGM lead-acid battery 6V 38Ah

The OPTIMA RedTop RT S 2.1 is a revolutionary 6-volt high-performance starter battery that, thanks to patented SPIRALCELL TECHNOLOGY®, delivers maximum starting power in a compact and extremely rugged case. With a nominal voltage of 6 V and an enormous cold cranking current of 800 A for this class, it is the ultimate solution for classic vehicles and demanding applications that require a reliable and powerful 6-volt energy source. Its extreme vibration resistance and absolutely maintenance-free, leakproof design make it the first choice for classic cars, hot rods and tractors.Highlights at a glanceMaximum 6V starting power: Offers the highest possible starting performance for reliable engine starts, even in large-displacement 6-volt engines.SPIRALCELL TECHNOLOGY®: Unique spiral cell construction for extreme vibration resistance and a longer service life.Extreme vibration resistance: Up to 15 times more vibration-resistant than conventional batteries, ideal for use in older vehicles without modern suspension.Absolutely maintenance-free and leakproof: The sealed AGM construction allows installation in almost any position and prevents paint damage caused by acid leakage.Long service life: Lasts up to three times longer than a conventional 6-volt starter battery.Maximum performance for classic vehiclesThe OPTIMA RedTop RT S 2.1 was specifically developed to bring the performance and reliability of modern technology to classic 6-volt vehicles. It is the ideal choice for classic cars, classic vehicles, hot rods and historic agricultural vehicles, which often have engines that are difficult to start. Even after longer periods of inactivity, as is typical for collector's vehicles, it reliably supplies the necessary power for an effortless start.Superior SPIRALCELL TECHNOLOGY®At the heart of every OPTIMA battery is the unique SPIRALCELL TECHNOLOGY®. Instead of flat lead plates, high-purity lead spirals are used, wrapped in glass fiber fleece (AGM). This compact and extremely stable design minimizes plate spacing, maximizes active surface area and reduces internal resistance. The result is unrivaled starting performance that can be consistently delivered even under the harshest conditions.Built for the most demanding conditionsThe OPTIMA RedTop is designed for tough use. Its sealed construction not only prevents acid leakage, which is especially important in valuable classics, but also evaporation, making it absolutely maintenance-free. The rugged construction made of impact-resistant polypropylene and the extreme vibration resistance ensure that vibrations and shocks cannot harm the battery. Features  ModelOPTIMA RedTop RT S 2.1 TechnologyAGM Spiralcell Nominal voltage (V)6 Capacity (Ah)50 Cold cranking current EN (A)815 Dimensions (L x W x H in mm)254 x 90 x 206 ConnectionSAE-Autopol Weight (kg)approx. 8.5  FAQs about the OPTIMA RedTop 6V batteryWhat is the main advantage of SPIRALCELL TECHNOLOGY® in a classic car?In classic vehicles, spiral cell technology offers two decisive advantages: first, extreme vibration resistance, which is of great benefit in older chassis. Secondly, it is absolutely leakproof, which protects valuable paint and body parts from acid damage, a common problem with old wet batteries.What is the difference between OPTIMA RedTop, YellowTop and BlueTop?RedTop: A pure high-performance starter battery for maximum starting power. Ideal for vehicles where starting is the main load. YellowTop: A 12-volt dual-purpose battery (starting and supplying) for vehicles with high energy requirements due to additional consumers. BlueTop: A 12-volt special battery for marine and leisure vehicles.Do I need a special charger for this 6V AGM battery?Yes, it is very important to use a modern, microprocessor-controlled charger that is suitable for both 6 volts and AGM technology. Old, unregulated 6-volt chargers can damage the battery due to overvoltage.Can this battery be deeply discharged?The RedTop is designed as a pure starter battery and should not be deeply discharged, as this can shorten its service life. For applications where power is regularly required for consumers at a standstill (e.g. a music system), a YellowTop or BlueTop battery (which are only available in 12V) would be the right choice.How should this lead-acid battery be disposed of?Lead-acid batteries contain environmentally harmful substances and must not be disposed of in household waste. You can return your old battery free of charge to any retailer selling new batteries or municipal recycling centers to ensure proper recycling.

The ULTRALIFE URB1270 is a state-of-the-art lithium iron phosphate battery (LiFePO4) designed specifically as a more powerful drop-in replacement for conventional 12V 7Ah or 7.2Ah lead-acid batteries (SLA). It utilises the standard housing of common lead-acid batteries, but thanks to lithium technology, offers a drastic reduction in weight, a constant voltage level, and up to 10 times longer cycle life. An integrated battery management system (BMS) provides maximum safety and automatically protects the cells.Highlights at a glance1:1 lead-gel replacement: Fits exactly into the holders and housing dimensions of common 12V 7Ah/7.2Ah lead-acid batteries (such as Yuasa NP7-12).Extreme cycle stability: Offers over 2000 charge cycles at 100% depth of discharge (for comparison: lead-acid batteries often achieve only 300-500 cycles).Ultralight: Weighs only approx. 1.06 kg, less than half the weight of a comparable lead-acid battery (approx. 2.5 kg), ideal for portable devices.Integrated BMS: The built-in Battery Management System monitors every cell and protects against overcharging, deep discharge, and short circuit.Safe chemistry: Lithium iron phosphate technology (LiFePO4) is considered the safest lithium variant, is thermally stable and non-combustible.Constant performance: Maintains a voltage of approx. 12.8 V almost constant up to nearly complete discharge, while lead-acid batteries lose voltage continuously.Ideal for medical technology & roboticsThe URB1270 is the perfect choice for applications where weight and lifespan are critical factors. It is commonly used in medical trolleys, mobile measuring devices, robots, electric scooters (scooters) or high-quality children's toys. As it has no memory effect and does not sulphate even when partially discharged (unlike lead-acid batteries), it requires much less maintenance and is significantly more reliable in long-term use. Features ModelULTRALIFE URB1270 (LiFePO4 SLA replacement) ApplicationUPS, medical technology, industry, robots (1:1 lead-acid replacement) TechnologyLithium iron phosphate (LiFePO4) with integrated BMS Voltage12.8 V (Nominal) - operating range 10V - 14.4V Capacity7.6 Ah (Comparable to 7-9 Ah lead-acid) / 97 Wh Max. discharge currentapprox. 10 A (continous) / integrated BMS protection Dimensions (L x W x H in mm)151 x 65 x 93 (standard size as 12V 7.2Ah) Terminal arrangementStandard (Suitable for standard connection cables) TerminalFaston 6.3mm (F2) - flat connector Base railN (Flat base) Special features>2000 cycles, very light, BMS (protection against over-/undervoltage) Weight (kg)approx. 1.0 (vs. 2.5 kg for lead-acid)  FAQs about the Ultralife URB1270Can I continue to use my lead-acid charger?This is the most important question when switching to lithium. In principle yes, but: The URB1270 is designed to be compatible with many standard lead-acid chargers (AGM/Gel) as long as the charge cutoff voltage is between 13.6 V and 14.8 V and no desulfation function (high voltage pulses) is active. For optimum performance and service life, however, we strongly recommend a dedicated LiFePO4 charger (CCCV characteristic).Can I connect the battery in series (24V)?According to the Ultralife data sheet, the URB1270 is often approved for a series connection (up to 2 batteries = 24V) or parallel connection. Please be sure to check the current data sheet for your specific production batch, as BMS specifications may vary. Both batteries must be fully charged before connecting them together.Is the higher price worth it compared to lead?If you use the battery cyclically (charge/discharge daily), then yes. A lead-acid battery often has to be replaced every 1-2 years. The Ultralife lithium battery often lasts 5-8 years or longer with the same use. Over its lifetime, it is therefore often more cost-effective, and you save a lot of weight as well.

The XCELL XCELFP1212S is a compact lithium iron phosphate battery (LiFePO₄) with a nominal voltage of 12.8 V and a capacity of 12 Ah. Equipped with an integrated battery management system (BMS), it offers reliable protection against overcharging, deep discharge, short circuit and overtemperature. With over 2000 charge cycles at 80 % depth of discharge, this battery is the ideal choice for applications where longevity, safety and compact dimensions are paramount, for example in mobile energy systems, emergency power supplies or as a replacement for VRLA batteries.Highlights at a glanceCompact power: 12 Ah capacity at 12.8 V – 153.6 Wh total energyDurable: More than 2000 cycles at 80 % depth of discharge (DOD)BMS integrated: Protection against overcharging, deep discharge, short circuit and overtemperatureRobust housing: ABS container seamlessly replaces VRLA batteriesFast charging capability: Efficient charging times with high current acceptancePowerful in diverse applicationsWhether in mobile devices, compact solar storage systems or as a reliable emergency power source: The XCELFP1212S impresses with its versatility. It is lightweight (only 1.21 kg) and compact (151 x 65 x 93.5 mm) and can be used even under demanding environmental conditions from -20 °C to +55 °C. By connecting up to two batteries in parallel or up to four batteries in series, a custom scalable energy system can be built.Efficiency and safety by designThe integrated hardware BMS reliably controls and monitors all charging and discharging processes. It protects against typical risks such as deep discharge or overtemperature, increasing service life and operational safety of the battery. The XCELFP1212S is maintenance-free, gas-free and has no memory effect, ideal for modern energy storage solutions.Robust LiFePO₄ technology for greater safety and longevityEquipped with cylindrical 21700 (3 Ah) LiFePO₄ cells, the battery stands out for its thermal stability, low self-discharge and high cycle life. Compared to conventional lead or lithium batteries, this cell technology offers a significantly higher level of safety and longer service life, even with frequent use under heavy loads.Features  ModelXCELL XCELFP1212S Battery typeLiFePO₄ (lithium iron phosphate) Nominal voltage (V)12.8 Capacity (Ah)12 Maximum discharge current12A (continuous) Recommended charging voltage14.4V - 14.6V Float charging13.6V - 13.8V Operating temperature (°C)Charging: 0 ~ 45 / Discharging: -20 ~ 60 Storage temperature (°C)-10 ~ 35 Service life>2000 cycles at 100% depth of discharge Dimensions (L/W/H, mm)151 x 98 x 100 Weight (kg)approx. 1.5 ConnectionFaston 250 (6.35 mm) Protection circuitIntegrated BMS  FAQs about the XCELFP1212S LiFePO₄ batteryHow many charge cycles does the XCELFP1212S battery offer?The XCELFP1212S achieves more than 2000 charge cycles at 80 % depth of discharge (DOD), which corresponds to a service life of over 10 years depending on application.Is a battery management system (BMS) integrated?Yes, the integrated BMS reliably protects the battery against overcharging, deep discharge, short circuit and overtemperature.For which applications is the XCELFP1212S suitable?The battery is ideal for compact energy storage solutions in fields such as mobile devices, rehabilitation and medical technology, UPS systems, renewable energy installations as well as caravan and marine applications.Can the battery be charged with conventional lead-acid chargers?Yes, the integrated BMS protection circuit allows charging with standard chargers for lead-acid batteries.Is the battery a compact and lightweight replacement for lead-acid batteries?Yes, it is compact, lightweight (approx. 1.21 kg) and replaces 12 V–15 Ah lead-acid batteries more efficiently thanks to low internal resistance and constant voltage characteristics.