The Schumacher SC1389 Battery Charger and Maintainer is a great option for sequentially charging up to three marine batteries. The microprocessor automatically adjusts the amperage rate, with multi-stage charging to extend battery life. Includes a dynamic LED charge status interface with programmable settings, and reverse hook-up protection which prevents the charger from operating if the clamps are reversed. Can be permanently mounted for ongoing use and convenience. Schu Eco Energy meets the highest industry standards. Compatible with standard, AGM, gel, and deep-cycle batteries.