mophie Juice Pack Air - battery case for cell phone

As a rechargeable battery case, the mophie juice pack air is designed to virtually double the time you have to Rock, Talk, Surf and Send with your iPhone 3G or 3GS.

The juice pack air is a rechargeable external battery concealed inside of a protective form-fitting case for the iPhone 3G & iPhone 3GS. It offers you the full protection of a hard-shell case while providing virtually twice the battery life of the iPhone alone; all in an ultra-thin, light-weight, low-profile design.