The STANLEY ChargeIt 1 Amp Battery Charger Maintainer is designed to maintain the 12-volt battery charge in stored vehicles, including those found in RVs, specialty vehicles, antique and classic cars, marine deep cycle batteries, motorcycles, lawn mowers, ATVs, snowmobiles, personal watercraft and more. Use 1 of the 2 included connections (battery clamps and O-rings) to charge up batteries then keep them topped off once fully charged. This STANLEY battery charger is fully automatic with integrated reverse polarity alarm and circuit protection that prevents overcharging or short circuit.