If you facing low battery problem of your iPhone on the road than check this new Battery Pack for iPhone 4, it is an portable backup battery case for your iPhone 4 and just 6mm thick and weight around two ounces. It is super smart, slim protective case, The interior of the offGRID™ conceals an ultra thin rechargeable battery with an Apple Dock Connector plug, allowing you to charge your iPhone 4 while maintaining low-profile protection.
The offGRiD is very easy to charge, you just have to plug in the included micro-USB cord to store the power. It also featured with built in glowing blue lights on the front of the case, so you’ll be sure to know how much battery backup have.
Price: $38.88 | Buy @Amazon