They tested that too, actually. Heat, I mean. It’s in a different one of the channels videos. It’s easy to find, since the channel only has like 10 videos and only a few are about phones .

You say that like batteries don’t need replaced every few years or that they didn’t design the Samsung Note 8 phone that kept catching on fire.

Engineers get told to make the phone charge as quickly as possible, while still lasting 2 years. After that, the company with those engineers pretty much wants the battery to fail, so they can sell a new device.

The one thing I wanted to see from that video, was also just testing the batteries until they went below like 75% capacity. The initial degradation may start off similar for capacity, but that doesn’t mean it will stay that way.