Personally after the 17.4 update my battery has improved
I hope for the same.
The worst part is that after clean instal I could get 9-11h on Wifi. After 2-3 weeks again only 6h on same wifi network. On mobile data? Half of wifi time. Maybe even less. That means 2-3h sot right now. Unusable. Someone can say "you found solution" maybe but I am tired of erase and all processes I need to do after that. I've done it 4 times on my 15 Pro. Ive never done that so often. Today I tried "reset network settings". Because mobile data and Wifi were considered as an issue I hope it will help.
If not I will try reseting all settings. It deletes Apple Pay cards (I hate that) but it is still better option that clean install.
Anyway. Clearly something is not right. My wife's 14 plus also loses battery to fast but she doesn't see this. So I think iOS 17 is full of bug and worst battery performance in Apple's history. I know I know. After every update people say things like that. Sure but mostly one clean instal or hard reset (which people don't try before posting) resolve the problem. Not this time. As I said. I've done clean install 4 times and it helps only for a while. Why? I asked Apple to check logs. Maybe there is something in the background which we don't see.