Charge up your summer car or boat after a winter of sitting with the Schumacher Electric 800 MA 12V Automatic Battery Maintainer. The reverse hook-up protection prevents your battery from becoming overcharged and being damaged, and the multi-stage charging ensures that the battery is charged precisely and safely for full battery life. Schumacher Electric 800 MA 12V Automatic Battery Maintainer - Battries Chrgrs And Accessories at Academy Sports