Hey guys, I've been looking for a portable emergency charger that can go on your keys like this: http://www.mophie.com/product-p/2025_jpu-reserve-2.htm But obviously for the iPhone 5. Used to have this for my iPhone 4 and was great for a little bit of extra juice when out and about. Has anyone found anything like this compatible with the iPhone 5? I live in the UK so needs to be available here. Thanks in advance.