My understanding of our conversation:

* You: That video is not relevant because it's about battery makers

* Me: The conversation is about battery makers

It seems I'm missing something.

The person who linked it was saying it is evidence of batteries being unsafe because it goes over things that can go wrong.

I was saying it's educational for battery makers and the video isn't about batteries being unsafe, the guy in the video makes his own batteries and is talking about what to avoid.