If you need to extend the use of any USB rechargeable devices the Satechi portable power pack is the best choice for you. Between 1 Amp ad 2 Amp dual USB sockets and the ability to hold a charge for over 3 weeks you have the best way to keep an outlet by your side to charge your Iphone, Kindle or tablet in record times. Satechi makes a few models and this is my favorite for keeping my EyeDevices and Kindle topped off.
