The problem is that the battery is not user replaceable and when the battery gets weak enough it will not fully power the headset so it won’t function properly or it will have a very short run time before discharging. It is unfortunate that all the wireless headphones are only going to work for a few years of heavy usage before being used up.

I take the earcups off my AirPods Max when I am not using them so they can dry out as they have the risk of condensation. I also put a small piece of scotch tape over the connector pin hole in each ear.