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. During SXSW last week, I found out just how awesome the concept behind the Third Rail Smart Case was. I had three Smart Batteries with me, which was way less bulky (and way less expensive!) then carrying three separate case chargers, like the Mophie Juice Pack Air or something similar, and the fact that I could use the Smart Batteries to charge my other USB devices was a fantastic bonus. You can find the Third Rail Smart Case on Amazon.

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