Optimate 3 Charger - 38070257 - OptiMate 3 is 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 - - - - - - - - - - - - - - - - - -