The Battery Tender 022-0148-DL-WH 12-volt/1.25-amp 4-Bank Battery Management System is designed to fully charge up to four 12-volt batteries simultaneously and maintain each at its proper storage voltage without the damaging effects caused by some trickle chargers. This lightweight, microprocessor-controlled unit provides a safe, constant, four-step charging current for every vehicle stored in your garage, shop, barn, or boathouse. The system is compatible with all AGM (absorbed glass mat), sealed maintenance-free and flooded batteries commonly found in some automotive/farm equipment, motorcycles, ATVs, and personal watercraft.