The Portable USB Power Supply is a small portable battery that you can carry on your key chain, which comes with a bunch of charging accessories that will let you charge your mobile phone and other gadgets via USB. At just $19.99, this is a no-brainer. You will always have juice.
It will work with multiple phones, media players and many other devices. It sports a dual module design with one input for charging and a detachable power supply that contributes to the portability of the device. All you need to get juiced up is your USB cable.