Lightweight Lithium Ion starter battery, 7.5 lb / 3.4 kg kilogram, specially developed for Racing cars up to 4 Litre using alternator. 4x4 ALMS Britsports DTM Group C GT Endurance GT's LMS NASCAR WTCC BTCC WRC Dakar Rally Raid Racing cars 4 Litre and above using alternator, reserve capacity for endurance and rallying. This newly developed battery is designed to replace the much heavier 70 to 100 Ah lead/acid battery. The super B 20P is based on the safe Lithium Iron Phosphate technology (LiFePO4), better known as Lithium Ion. The super B 20P delivers up to 1200 Cranking Amps. The super B 20P offers many advantages over conventional 70 to 100 Ah lead/acid batteries: weighs less: as much as 80% weight saving; < 7.5 lb / 3.4 kg recharges many times faster: within 5 minutes after starting your engine the battery will be recharged; is much smaller: 1/3 or less of the space; 4.7 inch, 9.3 inch, 3.2 inch (WxHxD) / 120mm x 236mm x 82mm (WxHxD); has a longer service life: more than 5 years instead of 2 to 3 years; has a low self-discharge rate. Technical specifications Nominal capacity and voltage 20Ah, 13.2 V EqPb (Equals lead acid battery) 70 to 100Ah Recommended standard charge method 25A to 14.4 CCCV, 45 min Recommended fast charge current 80A to 14.4 CCCV, 15 min Maximum continuous discharge 400A Pulse discharge 1200A Recommended charge and cut-off V at 25°C 14.4V to 8V Recommended charge and cut-off V below 0°C 15.2V to 2V Operating temperature range -22°F to +140°F / -30°C to +60°C Storage temperature range -58°F to +140°F / -50°C to +60°C Battery weight 7.5 lb / 3.4 kg Dimensions 4.7 inch, 9.3 inch, 3.2 inch (WxHxD) 120mm x 236mm x 82mm (WxHxD)