If you’re tired of running out of power on the iPhone 4S without packing a bulky iPhone charger, then listen up. This Slim Case and Smart Battery uses a clever design to allow plug-and-play docking of an iPhone 4S external battery, allowing you to double the battery life of your phone in a non-intrusive way.
Third Rail System Slim Case and Smart Battery for iPhone 4S/4
Unlike other battery iPhone cases, the Third Rail case is as slim as possible, adding minimal bulk to your iPhone 4 or iPhone 4S. The cleverness comes in with the removable battery which quickly but securely fastens to the back of the case, allowing you to add extra power immediately.
It comes with 1250 mAh of battery power, allowing you to operate for an extra 7 or 8 hours of talk time. The battery can also be used to charge other microUSB devices like Android, BlackBerry or Windows phones.
Third Rail System Slim Case and Smart Battery for iPhone 4S/4
All in all, it’s a clever system that makes the most of clever engineering to squeeze in a lot of power into a system that just clips on when you need it, and can sit in your shirt pocket when you don’t.
For more information, check out the Third Rail System product page.