I would *really* not want to be that card reader/battery sled supplier right now.
Lithium-Ion batteries are one of the few things in this world where price and quality are nearly perfectly positively correlated AND a failure can be quite literally catastrophic.
The only saving grace is that it was a small battery that cooked off - I'm fairly confident in stating that the entire complement of extinguishers on a narrowbody aircraft don't have the capacity to completely extinguish a gaming-laptop-sized battery that is actually aflame and not just smoking.