OptiMate 3 and OptiMate 6 are suitable for all types of 12V lead-acid batteries of rated capacity from 3 to 50AhDiagnoses sulfated battery conditionRecovers severely neglected batteries from as low as 2 voltsAutomatic hourly test, advance warning of problemsInteractive float charge, max 800mA possibleNo risk of overcharging totally safe for vehicle electronics sparks suppressed safe for long-term battery maintenance automatic shut-down if short-circuited or battery disconnectedGlobal input (100-240V 50-60Hz), high efficiency (CEC listed), fully sealedIncludes two detachable, interchangeable battery connectors: a connector with eyelets for permanent connection and battery clips for bench charging