I think I posted some initial impressions somewhere in this thread, but after about 3 weeks with this phone, I must say that I'm still impressed with the battery life!
I came from a Motorola Droid Turbo 2 (which has a slightly bigger battery, a slightly slower chipset, and a dimmer screen), so I was worried that I would not be able to get a full 18+ hour day out of my phone (with moderate to heavy usage). Thankfully, the S7E has been making it through that entire period without any compromises!
I don't dim my screen (about 75% with auto brightness enabled). I don't close out my apps other than my games. I don't use any power-saving modes. I don't disable high-precision location settings. And I usually forget to turn off my bluetooth and WiFi when I'm at work (although I just found out how to make it turn off once I get to work...so we'll see how that changes things).
The only thing I do do is turn off the always-on display when I wake up (I only use it as my night-stand clock/alarm while it's charging) and I do not use the notification LED. I don't really do it as a battery saving measure, I do it because I have a smartwatch that does more than Samsung's AOD...and the LED is useless to me since I always have some type of notification. lol
So anyways, I am usually in the 20-30% after 16-18 hours of use. Granted, I am only using about 3-4 hours of SOT, but a good 30-60 minutes is used by a heavy game (Angry Birds 2 lately)! It's amazing how much faster that game is on the S7E, yet it's running cooler and still gets just as good battery life (compared to the DT2).