iOS 15.3 battery drain

Battery keeps draining so fast even when the phone is on standby.

Dunno what is this, but since the ios 15 was released, the battery of my iphone 11 (97% of battery health) was dumb.

The phone get really hot in some apps (like instagram while watching stories or reels videos) and the battery just drain like summer rains.

i’ve tried everything that they told me to do, but it doesn’t changed. I was hoping that IOS 15.3 will solve this problem, and nothing happened 🤡

[Re-Titled by Moderator]