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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 replaced the battery in a 2016 iPhone SE and it was hell. Microsurgery to get the phone apart, multiple attempts at undoing the glue, and at the end the home key didn't work. Result: upgraded phone.