Compatible with all tools and chargers of the Bosch Professional 18V System and the AMPShare Alliance Extended runtime for the 18 V tools when using the GBA 18V 4.0Ah Only 65 minutes charging time to charge the GBA 18V 4.0Ah with the GAL 18V-40 Additional data Battery voltage 18.0 V Battery 1 weight 0,619 kg Battery charging voltage 14.4 – 18 V Charge current 4 A Charger weight 0,55 kg Cell type Li-Ion Charg. time at bat. cap. 4.0 Ah (80%/100%) approx. 48/65 min