The Bosch GAL 18V-40 Professional Compact Charger has a 4 A charging current for fast charge times. It charges a GBA 18V 4.0 Ah battery up to 80% in only 48 minutes and a GBA 18V 2.0 Ah battery up to 80% within 24 minutes. This compact charger is part of the Bosch Professional 18V System and is 100% compatible with all Bosch Professional 18 V batteries. Additionally the GAL 18V-40 offers a wall mounting option. Also compatible with AMPShare, the multi-brand battery alliance.