I just noticed that somewhere along the line, apparently after the last update, the remaining battery life in days doesn't match the percentage anymore.
At 100% battery life remaining it shows... 3 days? 100% would normally show me 25 days.
THE FIX: Press and hold the top left button on the watch until the watch face goes blank. If you are prompted to do anything else from the watch, ignore the prompt and keep holding the button until the watch face goes blank.