Google search volume for "iphone 3g battery case"

Description: Extend the battery time on your iPhone 4S, iPhone 4, 3GS, 3G or iPod touch with a juice pack case from mophie. It's a protective case and a rechargeable battery all built into one. You can also charge and sync your iPhone to your computer through the cas

Description: Exogear iPhone 4 battery case, iPhone 3GS battery case, iPhone 3G battery pack and iPhone battery pack is a made for iPhone rechargeable battery case ranging from 1300 to 1500 mAh to virtually double the battery life of the iPhone