IPhone 4s battery stuck at 100 percent. How do I get it back to normal?

iPhone 4s battery stuck at 100 percent. How do I get it back to normal?
Ever since the update, I am having issues with the battery. Phone shuts down while it still shows 100 percent battery life. Normally not a big deal because I don't use it all the time but lately an issue when I'm working in Manhattan and it shuts down while in the middle of conversation or emailing.
I can't go around charging it every hour wondering what my battery life really is.
Please help!

My phone now is not working at all. It only works for a few minutes while it is plugged into the wall and then it shuts down and pops right back up showing it has 75% battery. It has been doing this since yesteday afternoon.
I tried the reset and it is still acting up. Dreading having to take this to the Apple store since it is past the initial 90 days and I will probably get charged for it. :( Dont want to shell out money for a new one since I just got this one in October.
Thanks for your help.

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