My iPhone runs out of battery extremely quickly?

I charge it all night so it's at 100% in the morning, and if i'm extremely lucky and hardly use it, i can reach noon with my phone dying out. My bluetooth is never on, I keep the screen-light almost on the lowest, and i never use the speakers. I bought it a year ago, and my friends never have this problem.
Suggestions?

Don't all iPhones run out of charge quite quickly? Mine does.
If yours seems like its really fast to run out, it could be a problem with the lithium battery.

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