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Is Fast Charging Killing the Battery? A 2-Year Test on 40 Phones
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This is a most excellent place for technology news and articles.
No, they're saying that some hardware manufacturers report 80% as 100% (as you noted) while others do not. Just like some manufacturers report 5% as 5% while others report 10% as 5% with the realization that most people misjudge when they'll be able to charge.