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iPhone 4 battery case (Third Rail Mobility System)

Credit  goes to YouTube reviewer Larry Greenberg for the following video, in which he reviews the Third Rail Mobility System – an iPhone 4 case with a removable battery.

The Third Rail Mobility system differs from other “back-up” cases, such as the Mophie Juice Pack Air, because the battery element is detachable, allowing for a slimmer overall case design.

For the time being the Third Rail Mobility System is available on Amazon. Supplies are limited!

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  • Kristal

    I have this case. It was quite expensive but so are most of the competitors, like the Mophie that you mention.

    I ended up spending over $100 on the case and spare batteries. It does, however, mean I’ve never been stuck with a flat iPhone!