IPhone losing charge very fast?

Okay, so I got an iPhone 4S, 16GB, at the end of August. I never had any problems with it until about a week ago. The battery started draining VERY rapidly. 10% per every 30 minutes. It hasn't been that quick every time, but it still only lasts about 4 hours. I unplugged it this morning from full charge and within 30 seconds of unplugging it, it was already at 99%. I have tried resetting all settings, turning off most of my notifications, and turning down the brightness. None worked. What are some solutions to help my battery charge go back to normal?

Go to your home screen. Double tap the home button. At the bottom of the screen, app icons will appear. Click one and hold down. Click the "x" on the top of each icon until there are none left. Repeat that procedure every day. It worked for me.

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