I have the S7 Proper( I guess that is what they are using?) and the battery life has been good. I usually am plugging it in at 16-17 hours with 30% left and over 3 hours sot. One day I did decide to just hit the battery with gaming and videos and still managed to do 12 hours on the battery and 6 hours sot. But as all things your mileage may vary. But I am impressed with the battery life for two things one 3000 mah and getting those results is awesome and this battery life coming from a Samsung my last Samsung was an S3 and it wasn't that great on battery . But I love this phone.
I'm a very light user and last charge I got 2 days and 6 hours. This charge its looking like I will get 3 days out of it!! I average about 2 and a half hours of SOT.
I'm happy with it. The first day (starting from 100% charge) I ran it down to 3% with 5h 31m screen-on time. I was CONSTANTLY playing with it and tweaking settings though, so my results may not be typical
Mine hasn't been that good, but I think I use a lot of updating apps, news, exchange, etc, and keep on auto brightness. My GS5 was about the same. I am at 30% after 12 hours of use and 1.5 hours on on screen time.
It appears to drain a fair amount while in use. Saw the battery drain 2% in the last 5 minutes. GSAM is showing almost 20-30% per hour when in use (just web browsing on wifi) and idle but no-doze use around 0-5% per hour.