Someone wants to give your iPhone 4 additional booze to move on at times when the Ultraman light starts blinking, but the method that they are offering might be slightly ‘deadly’. It’s called the Third Rail System, which includes an iPhone 4 Slim Case, all for only $90.

It hugs your phone snugly, and has a 1250 mAh Smart Battery that you can slide into place whenever you need a boost. The removable batteries can charge other devices over micro USB, and can be stacked up to four deep for charging multiple gadgets at once (at $60 a pop).

It’s also designed to be compatible with future cases, negating the need to purchase another complete solution each time you upgrade your phone, which is a very welcome idea, but I’m not sure how that really works since they didn’t mention this part.

SOURCE via Third Rail Mobility