The Schumacher Electric SC1564 2/6/30/100-Amp 6v/12V Fully Automatic Battery Charger is a great choice for engine starting . charging and maintaining. It even charges lithium batteries. Its battery/alternator tester provides the charge level and helps diagnose electrical problems. The Start/Stop button and digital display make it easy to use. As a safety measure . the unit includes revers hook-up protection . which prevents the charger from operating if the clamps are reversed. For use with power sports . automotive and marine batteries. New in Box.