ijk I had the same with a release this spring. The battery sometimes need a calibration, and that might be triggered by a OS update, but maybe it was just a coincidence for you.
Anyways, you have to keep it charged to 100% for a few hours (I did 2 hours), then the battery should be finished with the calibration. Discharge to 20% or so and charge again. This time it should stop at 80%.