Belkin 4000mah portable dual usb rechargable battery pack green
The mixit power pack 4000 lets you keep your devices charged no matter where you are this versatile charging device has two usb ports so you can charge tablets e readers and other usb enabled devices even when you dont have access to a power outlet or a computer simply charge the battery pack before leaving your house and connect it to your device using your usb cable whenever you need a charge