Schumacher XM1-5 1.5 Amp Fully Automatic Power Charger and Maintainer Great for maintaining small and large batteries kept in storage such as motorcycles, classic cars, RVs, boats and more Unique automatic battery charger maintains both 6 and 12 volt batteries keeping them at full charge using float-mode monitoring LEDs indicate Connected, Charging and Charged Reverse-hookup protection The charger automatically determines whether the connected battery is a 6 volt battery or a 12 volt battery