The Bosch GBA 18 V 4.0 Ah M-C Professional Battery is high-endurance with Cool Pack technology. It has up to 65% longer runtime compared with a 3.0 Ah battery & Cool Pack technology. The Cool Pack technology means the battery could have a runtime of up to 100% longer than a battery without Cool Pack. The Bosch flexible power system means it is suitable for all tools in one Voltage class & it can even withstand a drop from 3m on to concrete.