Only 3 hours on battery doing nothing

hi all.
i am getting ready to take the 2009 MBP which I have had for a year and a half in to the genius bar and finally measured battery life at 3 hours doing absolutely nothing. This means I am down to about 2 or 2 1/2 hours when working on it.
i haven't had the time to address this before now (new to mac and have been busy converting over) and I am wondering if anyone has any good arguments to use with the mac genius if they say this is OK or dependent upon what you are doing while you are on the computer etc, etc.
TIA

oops. i have applecare...

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