The Bosch 1600A002U5 18V CoolPack 5.0Ah battery delivers up to 25% more runtime compared to the previous 4.0Ah CoolPack version. Bosch’s CoolPack technology is designed to extend the lifespan of these lithium-ion batteries by up to 100% versus standard alternatives. It is fully compatible with the entire range of Bosch Professional 18V power tools.