There's discussion on HackerNews too about whether these are:
1. Normal lithium batteries with some software exploit;
2. Batteries modified (e.g. intercepted during shipping) to explode
3. Added explosives
There's discussion on HackerNews too about whether these are:
1. Normal lithium batteries with some software exploit;
2. Batteries modified (e.g. intercepted during shipping) to explode
3. Added explosives
Maybe they bought the batteries from whoever made these :-) https://youtu.be/xu13u-jWasg