Bosch CORE18V 18 Volt Lithium-Ion 6.3 Ah Tool Battery

High-power cells deliver up to 1440 watts of power, 80% more than previous generation 6.0 Ah batteries and up to 20% longer run time. CoolPack 2.0 technology provides more cooling effect than the first version of CoolPack and up to 135% more battery life than batteries without CoolPack. System compatibility features backward and forward compatibility with all Bosch 18V tools and chargers. Charges to 80% in only 41 minutes and 100% in only 55 minutes using the Bosch 18V Fast Charger. Works in cold weather conditions down to -4 degrees F. Weighs only 1.8 Lb.