ElectronBadger
The 01 at the end tells you that you are on the security update firmware channel. That is the same OS like the normal 00 release, but with added security updates that get included in the 00 release on a later date.
Has something to do with Google, they implement security updates with a delay, for unknown reasons.
The 80% battery charging occasionally charges up to 100% every once in a while.
You need to look if charges to 80% again on the next charging attempt.
If so, that was just a normal behavior of the feature and not a bug.