The Mobie Juice Pack for iPhone 3G.
If there’s one complaint iPhone 3G users have it is the battery life, so it’s hardly surprising to see the first Apple certified “Works With iPhone” attached battery hit the market. The Mophie Juice Pack for iPhone 3G is a rechargeable lithium polymer battery in the form of a non-slip, soft grip case that is designed to more than double the battery life of your iPhone and protect it at the same time. It offers pass-through USB so the iPhone can be charged and synced with iTunes via the included USB cable without removing it from the Juice Pack.
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