Bosch 1600A002U5 18V 5.0Ah CoolPack Battery The Bosch 1600A002U5 18V 5.0Ah CoolPack Battery gives a further 25% increased runtime over the established 4Ah CoolPack Battery. Bosch state that their CoolPack technology increases the working life of these lithium batteries by up to 100% against standard lithium batteries in the market. Features: Increased runtime Integrated fuel gauge - for fast and easy charge status Cold weather operation - battery will work down to -20°C Durable housing - survives 3m drop Flexible Power System - works with all Bosch 18V Lithium-Ion tools Specification: Voltage: 18V Capacity: 5.0Ah Battery type: Lithium-ion