Why doesn't my iPhone 4S hold a charge?

[MeisMe]

I got the phone last December around Christmas time. It used to last so long and I would use it All day not charge it at night wake up the next day and still have about 50-60% and that would last me for the whole next day and then some. It has No damage and all my setting to save battery are on. Like turning off Wifi, dimming the screen all the way down, keeping the apps running in the background killed and all that wonderful stuff.. Now I will have it charged to 100% and Me just turning the screen on puts it to 98% and if I check facebook for 5 minutes it goes to 88% and if i send texts or pictures it goes down to 69% literally that is my phone's exact patterns. I wake up usually around 7:30am and it is almost dead by 8:30-9. My phone lives on the charger. Why is it doing this can I get it replaced? Please Help! And don't tell me how to save the battery. I am a master at saving battery because that's ALL I do with this phone. Thanks!

[Tomays]

Wow thats definitely not normal. That sounds like a battery issue is my guess, if you have an apple store near you, take it to them and have them look at it. They may also replace the battery.