The Galaxy S6 might be a work of art, but Samsung sacrificed something when it switched to an all metal unibody design: a replaceable battery. Given the hunger for power many high end smartphones have these days, that almost seems like a liability. Luckily, ZeroLemon has your back. The ZeroLemoon Galaxy S6 3500 mAh battery case not only protects your precious smartphone, it also juices it up in a pinch. In fact, since its own battery itself is removable, it can power up other devices as well.