It depends on how many cycles you've put on the batteryThe more you use a lithium battery, the faster it will wear outGo to the Apple menu - About This Mac - More Info button - Power in the left hand columnThat'll give you a bunch of info including battery max capacity and cycle count245 is getting up thereBatteries usually start to show serious reductions in runtime or just die off completely around 300 cyclesIf this is a model with a removable battery, you can find them on Amazon for far cheaper than what Apple wants.
2 hours does seem very short for a MacBookYou should be gettring at least 4 hours out of it, probably moreHowever, if your computer has seen VERY heavy use and a large number of recharges then it's not uncommon for battery life to sufferPart of my job deals with corporate laptop programs and after 2-3 years of heavy use most of the batteries are lucky to last 3 hours (Lenovo/Dell/HP)Remember that battery life is dependent on what you're doing, tooWatching movies, image rendering, video conversions and other CPU heavy tasks will drain the battery quickly.
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