6s+.
1. 7 hours with about 90 hours standby with about 3 percent remaining.
2. 6 hours and 40 mins with about 110 hours standby with no percent remaining.
3. (now) on 49 percent and sitting at almost 4 hours usage with 48 hours standby.
I wasn't too happy with the 2nd one. FYI: it's a TMSC. I only found out by doing the battery drain test and checked the diagnostics log.
nPlayer was the app I used the most for # 1 and 2, but 3 hasn't used it at all. That might explain the better numbers so far, but I've also adjusted a few settings to save battery so that might be helping too...
To be honest I was expecting a little more as I'm used to my phenomenal wifi iPad air that after two years still hits 10-11 hours. It's a beast.