iOS 11.1.1 Battery Life

My iPhone 7 battery life ***** after updated to iOs 11. It never getting better with every updates of iOS 11. I'm now on iOS11.1.1. iOS10.3.3 can last for one day usage without charging, but with iOS11, I have to charge 2-3 times per day. Practically, iOS 11 has never come out with any stable update since September. The screen freezes sometimes. What a shame?I'm truly ****** off and disappointed at Apple.

Either you allow us to downgrade to a more stable iOS10.3.3, or u better come out with an update that is not battery draining.

Dont tell me to look into my settings, as I have did whatever you suggested. Dont tell me that my device is old, as I just bought this phone for 9 months.

If you never improve you operating system, I believe not only me, but most of your Apple users will start to look for other mobile phone.