This device is available as a single pack at Walmart, or a double pack through Sam's Club.
On the package it says you can get "up to 6 hours" of additional talk time on your cell phone using this device. What it DOESN'T tell you, is what type of phone you'll have to charge with one of these to get that kind of extra time. The power pack comes with three of the more popular tips for phones - Apple, mini-USB, and micro-USB. You have to charge the device via a USB cable connected to your computer, or if you have an A/C plug with a microUSB tip on it, you can directly plug it into the wall to charge it up.
I tested these on four phones via coworkers at work: An iPhone 4s, two Android phones (HTC Rezound, and Samsung Galaxy S), and a "dumb" phone (basic feature non-smart, prepaid phone from Net10). Using a fully charged Power Pack, it increased the iPhone's battery by 21%, the Android phones by only 10% to 11%, each, and the basic prepaid phone about 40%+, full from near 0 power. In other words, the amount of power these packs hold is FAR less than the package seems to suggest. In an absolute emergency if your phone is power-dead, then yes, it will give you enough juice to make an emergency call (in the case of the Android phones), or just a bit more with the others. But just note you won't get charge after charge out of one use with one of these. Shop around - there are similar devices that perform in similar (but better) ways.
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