There have been a few battery issues since the update, particularly the battery draining faster/needing to be charged more often and the indicator not working correctly. Most who have had these issues have had them "correct themselves" after a few recharges. If it has been too long for you to wait, then try 2 different things that have been reported by others to have solved these issues:
1. Let your battery drain all the way down to less than 5%. Turn the phone OFF. Charge for at least 2 hours AFTER the indicator reads 100%. (It may take 2 cycles of this routine for the problem to be eliminated.)
2. Turn the phone OFF; take the battery out for a few minutes. Put the battery back into the phone. This has been the "last resort" tactic that seems to fix the battery issues.
Hope these work for you.