More and more battery pack cases are coming out for the iPhone 5. Here's the latest: the uNu DX Protective Battery Case that will not only protect your phone but double your talk time, letting most iPhones last for two days on one charge.

The best part is just how much little bulk the case adds. It's 15mm thick and it looks pretty good as well.

The company making these cases are making interesting stuff. One, a prototype, intends to increase your battery life and protect your phone while adding an LED panel tot the back where you can connect it with Bluetooth and push custom notifications to it.  Learn more about what the company's up to at their site.

Meanwhile, check out the video below: