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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 know plenty of devices will stop charging when the battery is optimal and just say it's at 100% even though it's 80.
Samsung has a setting for 85%, i know my phone only charging to 85% does not get as hot.