I know about battery forum, but here’s about something else. Sounds like a system malfunction suddenly causing a rapid discharge. And don’t forget that I am using the beta version since the first release without any problems!Did Canasta get an update and it’s now not running smoothly on an iOS beta? Your usage is 43% just from that app.
It’s probably an app, which won’t get an update to the new iOS 17 SDK until official release.
But yeah, have a look over on the battery forum for iOS 17 betas here