iOS 15.4.1 is bad , drain the battery faster then before 🙄

I have updated from ios 15.4 to 15.4.1 with the knowledge that it is going to fix my battery. But after updating i am losing the charge like anything. I lost 10% charge just after one phone call. Apple please fix this battery problem which is very important. My model is 13 mini

You cannot go back. The battery will work overtime for a few days until the update is complete. Check this link...

The last update killed my battery! - Apple Community

rushali49 wrote: "...Apple please fix this battery problem..."

rushali ~ Apple isn't here; we're just users like yourself. Use this form:

iPhone Feedback

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My iPhone 11 Pro Max was at iOS 15.2 and the battery life was a bit bad then I updated to 15.4.1 and it drains even faster like I used an hour less and it drained the same amount of power

Sorry i am very new to this community. Thank you for your help.

Question: The IPSW website says that 15.4 is "unsigned" and won't install from iTunes. Any work around to go back to that version. 15.4.1 suck battery life out of my iPhone 12. Thanks.