The Energizer ENC8A 8 Amp Battery Charger Maintainer is a 6-volt/12-volt 8 amp fully automatic battery charger for premium charging applications. With 6-volt/12-volt auto voltage detection, this charger can do 2 amps for maintaining or 4 amp rapid charging. The digital display shows status and battery voltage measurement. Energy efficient and , this battery charger and maintainer will prolong the life cycle of your RV, boat, or car batteries!