iOS 15.4 battery won't charge

Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:

• Press and quickly release Volume UP button
• Press and quickly release Volume DOWN button
• Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF). 

Axel F.

Just updated my iPhone 12 as well, seems like working for me. But will monitor as well.

just updated to 15.4 phone won't charge at all and its dead now

I had to take my phone in for repairs. the update completely fried my battery

You are welcome. Glad it worked out for you.

Axel F.

I tried it dy. But still not able to charge from my all type of powerbank type C output. But USB don't have this kind of issue.

iPhone 13 Pro

My ipad pro stuck at 85%

Forced restart usually helps but doing it daily just to charge is not a solution. And the bigger issue with 15.4.1 is that is indicates it is charging and it is not!