Bosch 18V GBA 18 V 4.0 Ah ProCORE18V Battery

Performance of a conventional battery in the most compact size and weight
Latest cell technology offering same power as an standard 4 Ah battery – at significantly smaller size and better weight
Flexible Power System: 100% compatible with all new and existing Bosch Professional 18 V power tools and chargers
135% longer lifetime compared to a standard battery due to COOLPACK 2.0 technology preventing the battery from overheating