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Although each individual laptop's actual lifespan varies, on average a laptop will typically give you between three and five years of use. When talking about laptop lifespans, you actually have two different types -- the operational lifespan and the useful lifespan.
Over the years, we've found the battery life of laptops can range wildly: We've seen some systems push 7 hours, and others have trouble even clearing an hour and a half. Keep in mind that battery run time isn't everything--some laptops achieve long life by tacking on gigantic extended batteries or sticking you with absurdly low-power parts. For your benefit and ours, we've gone back and cherry-picked the front-runners in battery life for 2010 laptops.