Is Fast Charging Killing the Battery? A 2-Year Test on 40 Phones

TLDW; No

Basically the video is testing phones with varying charging speeds and how much battery degrades after 500 charging cycles. Also, the affects on performance after battery degradation at 5:37

Timestamps of some tests:
* Test results for different charging speeds at 3:06
* Storing batteries at 1%, 50%, 100% at 3:43
* Battery performance at 4:42

After 6 mins he talks about why the tests took 2yrs and how they did it 3 times.