Get from Amazon.com : http://www.amazon.com/gp/product/B008YMA7QS?tag=hawaiianlegac-20

Kinivo EB12X Portable Rechargeble Battery Pack - for iPad iPhone other tablets and smartphones

Sleek compact and portable USB device charger
Included car charging adapter for charging the battery and devices while driving
Acts as a power source and charger for USB devices - no need to look for AC power port when outside
Continue using your smartphone or tablet when its internal battery runs out The 12000 mAh battery pack can extend smartphone usage by at least 2x and tablets by 1x
Compatible with most USB devices - iPhone iPad Android and more