Is there anything you did once you got the phone to help get this sort of battery life? Mine comes off the charger and immediately says approximately 10hrs left. Yours had that beat and you are hours into it already.
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I got mine yesterday at 9:00AM, first client on my T-Mobile Store, first thing I did was just to wait for T-Mobile Update to complete and then without doing anything else, I went to recovery mode and cleared cache and Clear data (factory reset).
Then I began setting it and first thing I did was to turned off VoLTE, Wifi calling, Smart network and Scanning Always Available (last 2 in Wifi Settings), none of these are needed for me. Then I proceeded to disabled all Bloatware from t-Mobile and some Google Apps that I don't use like Google Play Games and Books and Google Plus. Turned Off Hot Word Detection Always Listening in Google Search.
After that began restoring my apps and data using Google and Hellium while it was charging to 100%, so I knew that right from the first charge my phone was already set as I wanted without Unnecessary apps and features draining battery, with that first full charge and still settings some Apps, playing with it all the time, settings all my contacts ringtones and linking them between accounts and the normal first time usage stuff, I managed to get 5 hours and 10 mins of SoT in my T-Mobile S6 edge.
I've been using the phone today since I woke up, normal stuff for me, and again it has 59 minutes of SoT with 84% of battery remaining. So, it is still averaging over 5 hours of SoT, great battery life for this battery size in a QHD screen. One important thing here is to use Dark or Black Wallpapers and/or Themes, and in my case I NEVER, EVER use any of my phones with Brightness over 25%, actually I always use between 15-20% in AMOLED displays, the 25% was my LG G3, and with the option to use Auto brightness while Outside, my eyes are used to that for years now, and if I turn that up immediately begins bothering my sight, so for those of you that always have a Mind set on Highest Brightness, ALL the time, give it a try, begin very low in a low light room, or just under a roof and get your eyes used to that and you will see that in a day or so you won't need to be cranking up that brightness, plus you'll save a lot of battery life doing so.
Like I've said many times before, if I managed to get constantly 4-4.5 hrs of SoT on a Moto X 2-14 with 2300 mAh and last year technology, I'm sure that I can get over 5 hours on the S6 easily and constantly, so far I was right.
I'll try to create a new thread soon, just like I did last year with the S5, showing screens with Settings and Bloatware Disabled, so if anyone of you want to follow my suggestions you'll welcome to do it. But so far with the above summary you can have an idea if you are looking for some help on this.