The Bosch Professional ProCORE GBA 2 x 4.0Ah starter set offers the performance of standard 18V batteries in the most compact size and weight. The ProCORE18V 4.0Ah is equipped with our latest cell technology the 21700 cells. Therefore this battery is more compact and offers a lower weight than a standard 18 V 4.0Ah battery. For a longer lifetime and runtime this ProCORE18V battery features our COOLPACK 2.0 technology for superior heat management. The compact charger GAL 18V-40 charges the ProCORE18V 4.0Ah battery up to 80% in only 48 minutes. Since 2008 all of our batteries are compatible with new and existing Bosch Professional tools in the same voltage class. The ProCORE18V 4.0Ah battery features a high-resolution five-LED charge level indicator.