Charge or jump start your battery with the DieHard 71323 12V 2-6A Shelf Smart Battery Charger Engine Starter. 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 10A boost for quick energy boost and 50A to jump start your car right away. LED indicators and buttons allow you to conveniently choose between charge, boost, and engine start. Also features reverse hook-up protection which prevents charger operation if clamps are reversed on battery.