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Our Pick for Best iPhone 4 and 4s Battery Case

We have toyed with the idea of getting an iPhone 4 case with battery for some time now, but until now we hadn’t done much beyond comparing the various iPhone 4 battery cases. But recently we found ourselves in need of an extended battery for the iPhone 4s (and thus an iPhone 4 extended battery case – or, as they are sometimes known, an iPhone 4 charger case). In fact, an iPhone 4 battery pack case, battery charger case, and battery case all refer to the same thing: an iPhone 4 rechargeable battery case. This is because a battery case for the iPhone 4 (and the iPhone 5, for that matter) contains an external battery pack which in turn feeds a charge to your native iPhone battery. This is our iPhone 4 battery case review with our pick for the best case, after looking at several types of iPhone charger cases (although we did not review the once-popular Exolife iPhone 4 battery case, as they are currenty not available).