Bosch have now added the 5.0ah Coolpack battery to their 18v range of blue power tools. Fully compatible with existing power tools and chargers that charge the 4.0, 3.0ah Cool Pack batteries. Featuring electronic coding for tools and chargers, high power contacts with silver coating, capacity indicator with 3 LEDs, red Cool Pack housing constructed of heat conductive material, in-built temperature sensor, large ergonomic release button for ease of use, robust housing and slide-in interface. Efficient Bosch cooling technology in and around the battery prevents heat damage, gives up to 65 percent longer run-time and up to 100 percent longer lifetime. 5.0Ah Cool Pack cells have finer 'windings' than 3.0Ah allowing more power density in the same pack size with less .