Third Rail have this week launched a new juice pack which has an innovative solution to removing the bulk from your iPhone, when the battery and extra power are not required. The Third Rail iPhone 4 case allows you to clip on and off the battery element of the case. Keeping the footprint of the iPhone as small as possible when you dont need extra power, by allowing you to remove it.
The other neat feature on the Third Rail Slim Case and Smart Battery design is that you can add more than one battery on top of the other if required, doubling or even trebling the power.
One battery adds an extra 1250 mAh to the capacity of your iPhone in the form of a lithium-ion polymer battery and each battery is fitted with a small button that when pressed will allow you to check the amount of charge remaining in your battery.
The Third Rail iPhone battery and case system is now available to purchase from their website for $90.
Have a look at our handy guide on how to improve your iPhone and iPad battery life.