Charge or jump start your battery with the DieHard 71341 6/12V 50/250A Gold Smart Wheel Battery Charger and Maintainer. Intelligent charge technology . microprocessor controlled . multi-stage charging adds precision . safety . and battery life. This unit prevents overcharging by monitoring and switching to maintenance mode when fully charged. Features 50A boost for quick energy boost and 250A to jump start your car right away. This unit has a 12' total reach with its 6-gauge 6' power cord and 6' cold weather flexible output cables with color-coded clamps. This easily rolls around your garage with its compact wheel design and retractable handle.