My battery life seems *astounding*
I'll swear on Saturday (when we got the phones), I did a full charge from the ~80% OOTB, and with all the use, it ran until noon the next day (though admittedly, I may have been plugged into my Mac a few times, so the charge was probably up and down ...)
I restored from an iCloud backup of my previous 6.
Currently at 8 hours usage time, 18 hours and 2 minutes of standby time, and still have 40% battery left.
I'm guessing I'll get close to 10-11 hours total. This is with watching some Youtube videos, music constantly on (at work), on LTE...no wifi, and doing some fairly consistent Safari browsing.
Yeah, my TIME SINCE LAST FULL CHARGE (which was a full charge and then _no_ additional charging) as of posting this is exactly 12 Hours with 18 hours, 55 minutes of Standby, that included 1.3 hours of a driving game last night - I'm currently at 14% and running it till it goes dark!
[edit]
Wanted to add, I've been 90% on WiFi, but I did make a few calls (using my Mac, routing the call through my phone), maybe 1-1.5 hours or so. So probably less cellular use than some folks with less hours which makes sense.