I have installed the IOS 11 GM to my two iphones. One is a 6+ and my other (work phone) is a 7+.
Since istalling the IOS 11 GM, both phones are hot to the touch, (no open apps) and the battery life from full charge to empty is about 4 hours.
I would expect battery life to be short on the beta version, but not the GM.
Any ideas?
do not forget your iPhone the first two days have to index a lot
difference is really big my iphone SE goes almost 5 days without having to charge on iOS 10.3.3
My iPhone 6 on iOS 11 GM 2 days with luck have in my iphone 6 replaced the battery
by an original battery of apple now he goes on for two days without charging
and at night I lose 20 percent battery standby mode
Do you have iOS 11 installed in dfu or over air in dfu mode is best i always do that
and then restore icloud backup
