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

https://news.ycombinator.com/item?id=41567573

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Discussion

Maybe they bought the batteries from whoever made these :-) https://youtu.be/xu13u-jWasg