Iphone 8 plus battery drain faster after ios 11.2.2. update

Hi, I have been using iPhone 8 plus 256 GB since first week of December 2017. Until iOS 11.2.2 update I had no problem with my phone. However, I have serious battery draining problems now. Battery drains faster than before. Normally my phone used to last at least 11-12 hours with an active usage. After iOS 11.2.2 update now it lasts 9-10 hours barely. I tried lots of things to solve the problem: I restarted my phone, I reset all settings and data, backed up and restored. Also I tried "maximizing battery life and lifespan" tips. None of them worked at all. I'm not sure if my phone works normally or need any technical support. Should I take it to Apple experts to get service or repair? Thanks for the reply and attention.