PRO GAL 18V-40 Batteries & chargers | Compact: Due to its modern design it is very compact, Compatible with all batteries of the Bosch Professional 18V System and the AMPShare Alliance, With 4 A charging current it charges the GBA 18V 4.0 Ah battery up to 80% in only 48 minutes, GBA 18V 2.0 Ah up to 80% in 24 minutes