My battery drains fast on iOS 15.4.1

iPhone 11 and later models, battery performance --> About the battery and performance of iPhone 11 and later

My battery drains fast on iOS 15.4.1 i don't know why, and my iPhone is still new just bought it 1 mouth ago. Any Solution

It will drain fast for a few days

The last update killed my battery! - Apple Community

The remedies are mostly in here

The last update killed my battery! - Apple Community

including the battery self-discharge test. Even new phones have been found to be leakers in this forum