silentwitness
Android Expert
I just came across this article you can remove the battery from the s6 but its quite a tedious process and you would void your warranty.
http://www.zdnet.com/article/samsung-galaxy-s6s6-edge-removing-the-non-removable-battery/
http://www.zdnet.com/article/samsung-galaxy-s6s6-edge-removing-the-non-removable-battery/