18 V 4.0 Ah battery with extended runtime for all 18 V class tools Compatible since 2008: all of our batteries are compatible with new and existing Bosch Professional tools in the same voltage class. Extremely fast charging speed for all 18 V batteries, charging a standard 18 V 4.0 Ah battery to 80% in only 48 minutes 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