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Why Charging Your Gadgets Over 80% Is Such a Bad Idea | iFixit News
(www.ifixit.com)
This is a most excellent place for technology news and articles.
I have a Dell Laptop (Latitude 7390) where I changed in the bios some option to maximize battery longevity and 6 years later it still lasts quite a lot.
I have a POS HP from nine years ago and the battery still lasts two hours. Just depends on the battery size I guess