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some of the older batteries suck. I cant remember the type they are call, like nickle metal or something, but they have "memory" and last longer.
what happens is when you have a full battery and let it go down only 75% and then recharge and do it over and over, the battery then thinks 75% is "empty" and over time blows the life of it.
batterys have to be replaced every few years depending on use. my sony laptop lasts for like 40 minutes if im lucky, and the dell lasts 2 hours
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