IPhone 4s battery draining really fast?

I got my first iPhone 4 last January and it lasted until January of this year. The problem with it was the battery was draining 10% in 10 minutes and eventually wouldn't charge anymore. I updated to the 4s this february and saw no difference in the battery. It drains without even using it! We called apple and they sent me ANOTHER one and I got it Wednesday. STILL NO DIFFERENCE. I mostly only use it for twitter & instagram. I don't talk on the phone, or skype/facetime or any of that stuff. I'll go to school with 100% and come home with 20%. Obviously I'm in school so I don't use it THAT much. I just don't get it? This is my 3rd phone. 3rd phone with the same problem. Yes, I've lowered the brightness, turned off my location settings, closed my apps, EVERYTHING. Any ideas of what the problem can be?

Well you battery is obviously being damage some how. It could be the charger.

Turn of notifications that you don't need. Notifications light up your phone, which causes the battery to go down as well. Turn down the time it takes to go to lock screen.

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