Universal Battery Charger for USB & Rechargeable AA AAA NiMH NiCd Li-ion Batteries Compatible with the following devices AA rechargeable AAA rechargeable NiMH (nickel-metal hydride) NiCd (nickel-cadmium) Li-ion (Lithium-ion) Charges batteries inside devices that are charged by USB Charges batteries with the following specs 1) Voltage rating between 3.6v - 7.4v 2) Batteries aren't wider than 50mm (size of open charging tray) 3) Batteries are rechargeable (NiMH, NiCd, Li-ion) 4) Batteries have flat contacts (see video for example) The charger has a USB power port that can be used to charge any device that can be charged via USB. The above list is standard specs for most consumer grade batteries in Digital Cameras Camcorders Cell Phones PDAs MP3 Players GPS Units Consumer Electronics