Professional Ac arc battery charger START-220/320/420/520/620 Professional ELECTRIC Ac arc battery charger START-220/320/420/520/6201.START-boost 2.charge lead-acid battery 3.Suitable for cars, vans, light truck FUNCTION & FEATURE:single phase, portable battery charger for charging lead-acid battery with selector for normal or quick(boost) charge.Suitable for cars, vans, light truck.