Meet the GENIUS2D, one of our most powerful, highest-performing, energy-efficient, and compact onboard universal battery chargers yet. The GENIUS2D is a 2-amp (28-watt) - 100-240VAC 50-60Hz - 12-volt heavy-duty battery charger, battery maintainer, trickle charger, float charger, and battery desulfator for up to 40 amp-hours. It's designed to charge and maintain all types of sealed lead-acid batteries, including flooded, gel, maintenance-free, AGM, SLA, VRLA, as well as automotive, marine, RV, powersports, and deep-cycle batteries. Its advanced battery repair regenerator mode uses slow pulse reconditioner technology to automatically detect battery sulfation and acid stratification, restoring lost battery performance for extended battery life. It can be mounted almost anywhere - under the hood, engine compartments, garage - to charge and maintain any battery. Its next-generation charging regime utilizes fast charging microprocessor technology to rapidly recharge batteries without any manual intervention. It's a completely automatic, worry-free, professional, and commercial-grade intelligent battery charger with zero overcharge. Designed to be dual purpose - both indoors and outdoors - providing weatherproof and waterproof protection from the outside elements during any time of the year, including winter. A digital display provides the charging status and tests diagnostics for multiple conditions such as a dead battery, bad battery, reverse polarity, and more. It comes with a 24-inch AC cable and a 24-inch DC cable with 3/8-inch eyelet terminals designed to be securely mounted near your battery. And it's compatible with all types of gas and diesel vehicles, including cars, automobiles, lawn mowers, ATVs, UTVs, lawn tractors, trailers, trucks, SUVs, boats, campers, RVs, jet skis, PWCs, wave runners, snowmobiles, 4-wheelers, generators, golf carts, classic cars, including BMW, Mercedes-Benz, Porsche, Bentley, Maserati, Lexus, VW, Audi, Ford, Chevrolet, Corvette, Cadillac, Jeep, Prius, Toyota, Subaru, Nissan, Honda, Polaris, Seadoo, John Deere and more.