The biggest problem facing modern smartphones is battery life. If you're part of the Pokemon Go craze and you keep running out of battery, then a battery case will let you catch more Pokemon. Or you might just work long hours, make a lot of calls and want to be able to listen to music on your long commute.

We have rounded up a few of the battery cases for the iPhone 6S that will not only protect your device from bumps and knocks, but also give it a little extra juice when it feels like giving up.

All the cases within the gallery add some extra bulk to the super slim smartphone so be prepared for that, but they will also make sure the train journey home after a long night is entertaining, or that Pokemon session is extra rewarding.

We will update this feature as more battery cases catch our eye so keep checking back but for now, head to the gallery to see which battery case might be the one for you.