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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.
Battery life is very good for a 15-inch desktop replacement laptop. The Inspiron 15's 40-watt lithium-ion battery lasted 6 hours 19 minutes on our battery rundown test, beating last year's Dell Inspiron 15 (4:10) by more than two hours and the larger Dell Inspiron 17 5000 Series (5:20) by an hour.