Strange battery issue with EOS R7

I had something strange happen today and wondered if anyone else has had this happen. After using two different search engines I could not find anything similar.

Had my EOS R7 out yesterday with a relatively new, fully charged OEM Canon LP-E6NH battery. Took one hour of 1080p/24 video. Once finished I checked battery level, remaining power showed 60%.

This afternoon I took about 10 minutes of video using the same settings and about a dozen stills. I didn't check battery level but after turning camera off I noticed the bottom of the camera was warm. At that point I had not used it in about 20 minutes. That seemed strange. I put the camera back in its case (a padded shoulder carrier bag), put it in my truck and drove home. Half hour later I got home, took it out of the camera bag and the entire camera was VERY warm. Camera power switch was still in the off position.

I turned the camera on and got a big red "charge or replace battery before continuing" notice on LCD screen, and the battery was completely drained.

- camera was and still is in airplane mode
- no wireless or bluetooth enabled

I'm trying to recharge that battery now and see if its recharge performance reading in-camera is still good and if it still functions, but this was strange and not sure what to make of it. Thanks all for any advice.