The Bosch 18V 5.0Ah Li-ion Coolpack battery is not only designed to give superb power output, it’s durable too. In fact, the battery's light but robust housing has been endurance tested and remains fully functional after a 3-metre drop. The battery delivers 25% more run time than a Bosch 4.0Ah battery, as well as a lifetime that is up to 100% longer than a comparable unit without Coolpack technology. This battery is fully compatible with all Bosch power tools in the 18V range.