Despite the off-putting name, the Third Rail battery case for iPhones is a useful gadget, made all the better by the fact that it will work with future iPhone models by simply switching out the case.

Comprised of a protective case (Slim Case) and a universal, removable battery (Smart Battery), the Third Rail "System" is a thin, battery-enabled protective case that allows you to add extra power when you need it.

The light- weight battery can also serve as a stand-alone universal charger for other devices (via micro USB). Handy.

For road-warriors, pick up a few extras and stash them in your briefcase.

$89.99