Windows' battery indicator seems to be spontaneously imploding. All of this is while not plugged in.
Half an hour ago, it said the battery level was at 17%, with ~30 minutes of usage left.
Five minutes ago, it said it was charging with a 0% battery level.
Right now, it's at 100%, with 14 minutes of usage left.
.. what?
EDIT: Now the "usage time left" jumped to 45 days.