IPhone 4s battery dying in 2 hours?

Well I've had my iPhone for almost one year now and my battery is dying much quicker than it should be. I took my phone off the charger this morning (100% full) and went for a two hour run. I had music playing, but still, two hours is not right.So, what could be causing this? Oh and I'm running IOS 5.1 if that makes any difference.

Mine goes just as quick when I just leave it with music playing… Goes even faster if I have the brightness set to auto… Maybe contact apple about it and see if they can do anything/have any suggestions

Replace it.

It's a smartphone what were you expecting? Time to replace the battery.

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