The Schumacher SP1297 Battery Charger and 3 Amp Maintainer is a great option for car, boat, or power sport batteries. Energy efficient and automatic, the unit features easy to connect clamp and ring terminal adapters as well as a convenient hook attachment for hanging the unit outside of the work area. The microprocessor automatically adjusts the amperage rate, with multi-stage charging and float mode monitoring for optimum charging and maintaining to extend battery life. Includes scrolling digital instructions for ease of use and reverse hook-up protection which prevents the charger from operating if the clamps are reversed. Schu Eco Energy meets the highest industry standards. Compatible with standard, AGM, and lithium batteries.