Why does my iphone 4s battery die so quickly?

My phone can be on 100% Battery, and spending the whole day at the mall, barely being used, And after about 3 hours it goes to10% Battery. Why does it do that. Any suggestions?

Maybe the first time you charged it you didn't charge it fully. You can't fix that.

Try leaving your brightness turned up only about halfway. Also data roaming turned off. And the little bubbles that appear when you click your home button twice, (the recently visited apps, etc) hold and delete those to where there are none when you click twice on the home circle. They run down your battery somehow.

Mine did the same thing. I brought it up to the Apple Store, and they said to back it up and then restart it, and it STILL died fast. Then I took it in again, and they switched it out, and now I only have to charge my phone once every two days.

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