Those batteries may not blow up right away. It's a random thing. So our people have been referring to them as "sleeper" cells.
...sleeper cells
And the only documentation Samsung sent with the batteries was in Korean scribbles not Chinese, so the toymakers were confused about what it all meant.
...because they misinterpreted the Korean
Samsung inflated their stock price by writing the Galaxy Note 7 batteries off as a loss then secretly sold them across the border to China.