DESCRIPTION 2 x 18 V battery with 4.0 Ah capacity for extended runtime and fast charger 18 V 4.0 Ah battery with extended runtime for all 18 V class tools Extremely fast charging speed for all 18 V batteries, charging a standard 18 V 4.0 Ah battery to 80% in only 48 minutes Compatible with all Bosch Professional 18 V tools and chargers (Professional 18V System) ADDITIONAL DATA Battery 1 capacity: 4 Ah Battery voltage: 18.0 V Battery 1 weight: 0.619 kg Cell type: Li-Ion Battery charging voltage: 14.4 ? 18 V Charge current: 4 A Charg.Time at bat. cap. 4.0 Ah (80%/100%) approx.: 48/65 min Charger weight: 0.55 kg