Sandberg BatteryCase for iPhone 4/4S delivers more bang for your buck

Sandberg's BatteryCase is the latest in a long line of iPhone battery cases that claim to double the life of an iPhone - in this case the iPhone 4, though as you'd expect the case is also compatible with the iPhone 4S. In case you're not familiar with how these things work, there's no mystery: it's simply an iPhone case with an integrated battery. But how does it stack up against two of the market leaders, Mophie's juice pack and juice pack plus?

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