GBA 18V 4.0Ah Battery Pack. The GBA 18V 4.0Ah Professional battery from Bosch's 18-volt class is designed for extended runtime. With its higher battery capacity, it provides 100% longer runtime compared to the 18V 2.0Ah model. Additionally, this model features COOLPACK 1.0 technology for better heat dissipation, as heat can damage the cells. The COOLPACK technology ensures a longer battery lifespan and allows for longer operating times. It is compatible with all Bosch Professional 18-volt tools and chargers (Professional 18V System). The GBA 18V 4.0Ah Professional is a lithium-ion battery with a battery charge status indicator. Box; 1 x GBA 18V 4.0Ah battery.