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

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 Wi-Fi, 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'm a master at saving battery because that's All I do with this phone.

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.

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