PowerSkin for iPhone 4: The Electric Surfer [Review, Battery Case Week]The PowerSkin for iPhone 4 ($80) is a silicone case with a built-in rechargeable 2,000 mAh battery that claims to double your device’s battery life with patented “XPAL Power” battery technology. Like most battery cases, it uses a mini-USB port to charge and sync your iPhone simultaneously, and you can turn the case on and [...]
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