edit: after 20 comments, i’m adding a post description here, since most of the commenters so far appear not to be reading the article:
This is about how surprisingly cheap it is (eg $15,000) to buy a complete production line to be able to manufacture batteries with a layer of nearly-undetectable explosives inside of them, which can be triggered by off-the-shelf devices with only their firmware modified.
I am not an explosives expert, but I’ve seen enough YouTube videos about explosives to know that not all explosives explode in fire. Some are incredibly stable at extreme conditions right up until deliberately triggered. It all depends on the type of explosives.
There may still be ways to detect them, but it’s not necessarily going to be that simple.