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The 1900mah External Battery Charger Case for All New iPhone 4G . This item is designed to more than double the time you can Rock, Talk, Surf and Send with your iPhone 4. Simply plug this into your iPhone 4 to charge the battery when on the move.
The Battery Case is specially designed for iPhone 4 and has passed the strict over-the-air performance tests. The Battery Case also uses Apple dock so you can charge your iPhone 4 using your standard mains charger or USB cable, just as if the case wasn't fitted.
portable Battery charger case for Iphone 4/4s