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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.
the 400% figure is extremely misleading and based on old assumptions and old battery tech.
Also it you're not keeping the phone for 20 years then it doesn't make sense to calculate "total electrons" over the absolute entirety of the battery "life".