BOSCH GBA 18v 4.0 Ah Lithium Ion Battery Bosch Cordless 18v AccThe high endurance 18 Volt XL battery with 4. 0 Ah and COOLPACK technology Up to 65% more run time compared to existing 3. 0 Ah battery using high quality Li Ion cells Bosch COOLPACK manages the temperature of the battery cells actively and reduces heat up which is the main killer for every battery cell 18 V 4. 0 Ah batteries have the same weight as existing Bosch 3. 0 Ah batteries and are the lightest in the market Battery voltage: 18 V Weight: 610 g