Why does my iphone run out so fast?

So recently i got a iphone 4s…
and its be fourdays exact…
whenever i charge it one night full 100% and i take it out for school the next day. My iphone battery basically doesn't last long… ---
its supposed to last four hours… Or more…

is something wrong? And what can i do to last it longer?
i don't even touch my iphone while i'm charging it either…

If your using apps on it them it uses up the battery much quicker!

Maybe your brightness is up too high! To save battery turn down the brightness. Also turn off blue tooth if its on. And also turn down any volume.

One tip for newbee's is to tap the home button twice then on the open panel on the bottom you will see all the applications you have open. Next hold your finger down on one until it begins to shake. Next tap all the red "-" signs that you see in the upper left hand corner of the application icons to close them. The more you have open the faster they will drain your battery.

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