Using your smartphone for caching? Don't be caught without a charge. Use this 4 cell AA emergency battery to charge up your smart phone. The 4 AA cells mean you will get a full charge for your phone. Take this emergency battery charger with you on trips and keep your phone charged. Unlike other emergency batteries this one uses AA batteries which you most likely have with you or can be purchased from any corner store. The emergency battery charger has a USB out connection instead of a proprietary cable. This means that you can power up any device that uses a USB cable just be sure and have the cable you need with you.
Tested on iPhones and Blackberries.