The NiteCore Intellicharge i4 Battery Charger lets you charge four batteries at a time in a universal, automatic smart charger that's compatible with almost all types of rechargeable batteries including AA batteries, AAA batteries and C batteries, eliminating the need to own several chargers. The NiteCore i4 Charger is able to automatically identify Li-ion, Ni-MH and Ni-Cd rechargeable batteries and apply an appropriate charging mode (Constant Charge Current (CC), Constant Charge Voltage (CV) and Trickle Charge). The NiteCore i4 Charger has two micro processor-controlled charging slots that are capable of monitoring and charging batteries independently. Additionally, yellow and blue power/charging status indicator lights visibly indicate battery status to let you monitor the charging process. The NiteCore Intellicharge i4 Smart Battery Charger makes recharging as simple as insert, detect, and charge.