Looking to keep your rechargeable batteries ready to use? Check out the Ultralast ULGLION-4 Battery Charger! This intelligent battery charger is compatible with Li-Ion, NiCD, NiMH, LIFE04, and CR123A batteries. It also charges rechargeable CR123 batteries. It individually monitors each battery, and the LCD display also monitors charge current, battery voltage, charging time, and percentage, and more. It boasts an auto stop function when batteries are fully charged, as well as reverse polarity protection.