The bosch gba 18 v 40 ah m c professional battery is high endurance with coolpack technology it has up to 65 longer runtime compared with a 30ah battery and coolpack technology the coolpack technology means the battery could have a runtime of up to 100 longer than a battery without coolpack the bosch flexible power system means it is suitable for all tools in one voltage class and it can even withstand a drop from 3m on to concrete