Opus BT-C3100 V2.2 Smart Universal LCD LI-ion NiCd NiMh AA AAA 10440 14500 16340 17335 17500 18490 17670 18650 Battery Charger Easy-to-read LCD with back light showing battery Voltage, Charge / Discharge Current, Charging Time, Battery Capacity, etc. Charging current can be selected to be 200mA, 300mA, 500mA, 700mA or 1000mA ( 1500mA and 2000mA can be applied when only slot 1 or 4 is selected ). Default discharging current is 500mA. 4 Independent charging slots charge rechargeable batteries of different types and sizes and with different capacities at the same time Four working mode available at user's choice: Charge, Discharge, Test, Quick Test and Refresh