Battery Level Meter Seems to Bounce Around Now

I've been having a weird issue for the last couple of months that appears to be more prevalent now- I charge the watch (I typically stop at 80-85% anyhow), but now it seems to shoot up from like 80 to 100 when I unplug the watch.  Then after tracking on the first day, it still is stuck at 100%,.  The shooting up to 100% sometimes happens when I turn the watch off and the battery doesn't have a full charge, but is at like 85-90% or thereabouts.

Has anyone seen this odd behavior?