Since I've updated my iPhone6 to IOS11, my battery has been running down faster than normal.
I have done these things to try and extend the battery life. Whether it was because of one particular thing, a combination of a some or doing all of them, my battery is now functioning normally.
- turned off background app refresh
- turned off as many notifications as possible
- turned screen brightness to half
- set Auto Lock to 1 minute
- turned Siri off
- use home wifi
- turned off iCloud (only use it for Photo Stream)
- Bluetooth is off when I'm not using it
- when I charge, I only charge to 80%
I also did some other things mentioned in the link below. I don't know whether it was one particular action I took or a combination of some or doing all of them but my iPhone's battery now lasts the same as it did prior to updating to 11.
https://www.iphonelife.com/content/how-to-fix-battery-drain-ios-10-iphone-10-tip s-longer-battery-life