The Schumacher SS-15A2-OB is a true, dual-bank, on-board, 15 Amp marine charger that permanently mounts to your boat. Its weather proof, water tight seal ensures that there will be no leakage and is safe to store on-board, all year round. The charger works with regular and deep cycle batteries, including flooded, AGM and gel cell. This smart charger automatically remembers the last battery type selected.