This starter set includes a GBA 18V 4.0Ah battery and the compact charger GAL 18V-40. The GBA 18V 4.0Ah extends the runtime of the 18V tools. The COOLPACK 1.0 ensures better heat dissipation from the inside to the outside, resulting in a longer lifespan and runtime of the battery. Thanks to the included compact charger GAL 18V-40, the 4.0Ah battery can be charged up to 80% in just 48 minutes. It is compatible with all tools and chargers from the Bosch Professional 18V system and the AMPShare Alliance.