My battery is draining 3x times faster after upgrading IOS 10.3.3 to IOS 11.1.2

If you just updated give it 24/48 hrs. After the upgrade the phone must still do some file changes. This chews the battery. If it has been some time try a hard reset (power button + home button)

Also check to make sure something you turned off (push emails app updates) hasn’t been turned back on.

Please update us with your phone type so we might also offer other suggestions.

Here's a couple articles that give some tips:

https://9to5mac.com/2017/09/26/ios-11-how-to-improve-iphone-battery-life/

http://www.idownloadblog.com/2017/10/09/save-battery-ios-11/

https://ios.gadgethacks.com/how-to/improve-battery-life-your-iphone-ios-11-01777 56/

HI,

I am facing same issue with my 7 plus.