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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.
Late reply:
https://oukitel.com/pages/oukitel-wp33-pro
This replaces my old phone, Bluetooth speakers, battery banks, all that. Hella heavy, but so is all that other crap. I can drop it 5' deep in the swamp, go down and get it. Still testing!