Apc Universal Battery, 10WH (Discontinued by Manufacturer) The Mobile Power Pack is an innovative, rechargeable external battery pack, perfect for powering a cell phone, PDA, MP3 player or other small device. It's lightweight and small enough to fit in your pocket, as well as simple to use - just plug in the USB charging cable for your device (sold separately) and get up to 55 hours of runtime for your iPod Nano, and up to ten hours of talk time for most cell phones (depending on the operating mode of your device). The LED status bar lets you know how much charge you have left with the press of a button, and its state-of-the-art lithium-polymer battery technology delivers the most power and fastest recharge times, all in a pocket sized package. Now you have a stylish way to make sure your mobile devices never run out of power again. Includes: User Manual