The heavy duty, wheel charger is the perfect accessory to any home, farm, garage and recreational. It can be used on low maintenance, deep cycle 6-volt or 12 volt batteries. The 10-amp charge will will recharge batteries in 3 to 5 hours. The fast charge (40-amp) will recharge dead batteries in 40 min to 2 1/2 hours. The 200-amp provides engine cranking power for large vehicles.