Same for me.I had no battery drain issue, until now. In researching the problem I find this thread. My APP2 is on 5E133, and my charging case is draining like crazy. To be clear, only the case is draining. The AirPods themselves are still full.
Try to reset your AirPods and forget them on the iPhone settings.
This seems to have worked.
It’s just annoying that this is now at least the third time I had to do this.
Should have bought 20$ China Earphones