The Tekkeon TekCharge MP1580 Mobile Power Pack & Battery Charger uses either two or four AA batteries to provide an extra boost of juice for pretty much any USB powered mobile device on the market including iPod, iPhone, eReaders, smartphones, GPS devices, MP3 players, mobile phones and even digital cameras and camcorders.
The TekCharge works by connecting to your device with the USB cable that comes with it, or by using the TekCharge's included micro and mini USB adapters to plug directly into your device. Plus, there's a voltage regulator, so the TekCharge will not ruin your USB device or its battery. If the extra adapter you need for your device is not included, Tekkeon offers plenty of additional adapters (sold separately). The TekCharge even works as a battery charger, so if you use rechargeable NiMH or lithium AA batteries, the MP1580 will charge them for you.