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Is Fast Charging Killing the Battery? A 2-Year Test on 40 Phones
(www.youtube.com)
This is a most excellent place for technology news and articles.
The battery has a charge curve. What does the most wear or damage to the battery is the ends of the curve - either deep discharging the battery or charging it up fully to the point where it cannot take any more charge. It's up to the manufacturer where they want to put 0% and 100% on the curve - to protect and extend the life of the battery most manufacturers don't put 0% and 100% at the extreme ends of the curve.