Did something today I had been putting off for 6 months

https://lemmy.world/post/2708477

I have these and the left one is failing, much quieter. They also kinda have uneven battery usage. They wouldn’t help with the quiet audio, due to the warranty expired. I wonder if I could get them to bite on the battery issue.
I mentioned the difference in battery usage and heat when charging. The date of purchase and model may make a difference though. Bought mine at the end of 2021. This is a good article to get some info going into it. I did the online chat with Sony. Good luck!
Sony WF-1000XM4 severe battery drain & overheating issues

Sony WF-1000XM4 users report severe battery drain and overheating issues that have persisted for months. Potential workaround inside.

PiunikaWeb