Glorich Universal Quick Battery Charger with USB Input for Digital Camera, Camcorder, Cell Phone, AA, AAA batteries - charge Li-ion, Li-polymer, Ni-MH and Ni-CD Batteries Can charge AA & AAA Ni-MH Ni-CD batteries and most Li-ion, Li-polymer (camera, camcorder, cell phone and other devices ) batteries at 3.6V/3.7V or 7.2V/7.4V, provided the battery can be installed into the slots of the charger. Automatically detects "+" or "-" polarity and identify 3.7V, 7.4V lithium battery and Ni-MH, Ni-CD cells for easy battery installation; The red & green lights indicates charging status clearly. Over-voltage, short-circuit and over-time protections and defective battery detection. Charger Specs - Input: 5V via Micro USB cable; Output: 4.2V / 8.4V, Ni-MH 1.5V x 2 The battery slot spring clip has lock in the end position and can be released by pressing the lock-release button. Allowed max battery width of the side with metal contact pins: 5.1 cm or 2.0 inches.