- We show you the awesome Third Rail Slim Case and Smart Battery for iPhone 4 and iPhone 4S in this episode. The design of the Third Rail system is brilliant. The case itself protects the iPhone, but is super slim because of the fact that the battery is removable. When you need power, you just slide a Smart Battery into place, and your phone is charging. Even cooler, the Smart Battery can charge other USB devices on its own, not just iPhones.
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