OptiMate 3 and OptiMate 6 are suitable for all types of 12V lead-acid batteries of rated capacity from 3 to 50Ah Diagnoses sulfated battery condition Recovers severely neglected batteries from as low as 2 volts Automatic hourly test, advance warning of problems Interactive float charge, max 800mA possible No risk of overcharging; totally safe for vehicle electronics; sparks suppressed; safe for long-term battery maintenance; automatic shut-down if short-circuited or battery disconnected Global input (100-240V 50-60Hz), high efficiency (CEC listed), fully sealed Includes two detachable, interchangeable battery connectors: a connector with eyelets for permanent connection and battery clips for bench charging 7-step automatic battery saving charger & maintainer (12V 0.8A)