Compatible with most Li-ion digital camera, camcorder, and hand held device and mobile phone Li-ion batteries; as well as NiMh AA, AAA Cells. Micro Processor identifies 3.6V / 7.2-7.4V Li-ion batteries and AA/AAA NiMh/Ni-Cd cells. Automatically identifies the (+/-) poles to adjust charging. Controls Fast & Trickle Charge accurately to ensure the batteries are charged fully. Low-Voltage battery activation. Detects: Over-Voltage, short circuit and defective batteries. Overcharge and Overheat protection.