That article, while interesting, does not address button batteries. Maybe I missed it. I found it interesting that you can ship any amount of lithium batteries as cargo.

Button batteries are a different type. They don't overheat when shorted.

Anything which has energy overheats when shorted.

I upvoted you anyway, because by design, button cells have limited potential to cause damage when they short. Yes, they heat up, but they have very little energy to begin with, and a large amount of metal surface area which keeps thermal runaway in check.

Thank you for answering my question 4 layers below where I asked it.

Funny how the “don’t ask a question online, be confidently wrong” principle applies here so perfectly. I love it.