Third Rail System for iPhone 4 review: One battery to power them all - CNET
 CNET | Third Rail System for iPhone 4 review: One battery to power them all CNET All the money you have spent on cases and juice packs for the iPhone 4, or any smartphone that you have for that matter, only makes it that much harder to move on to a different device. This is what Third Rail Mobility, a new accessory ... Third Rail zaps iPhone case market with detachable battery pack Third Rail case does not add more bulk to your iPhone 4 Third Rail Mobility Launches Innovative Battery System for iPhone |