Prolong your battery's life with proper charging and maintenance. The Duracell 4 Amp Charger/Maintainer can take depleted batteries from dead-to-start in just 2 hours. The Charger/Maintainer's multi-stage charging protocol ensures an optimal charge on all types of 6V, 12V, and Lithium-Ion vehicle batteries, and features a maintenance mode that's ideal for keeping stored batteries topped off between uses. The 4 Amp charger/maintainer features a backlit LCD screen for best in class user experience, and is rated IP65 for weatherproof construction. The charger includes alligator clamps for periodic charging, as well as ring terminals for semi-permanent battery attachment (ideal for maintenance). Switching between clamps and rings is safe and simple thanks to the charger's quick-connect cable system.