Removing the battery and replacing it on the charger does nothing, it remains stuck at the same percentage. The only way I have found to remedy this is to go on a very short ride, just a few yards, and this seems to reset the battery and putting it back on the charger will get it charging again. BUT, the funny thing is the battery must have been fully charged all along, as in about 5 minutes it will register 'FULL', when it couldn't possibly have charged from a low percentage to full in that time.