I had a buddy that had kidney stones. Every day for a few months I would put tiny bits of gravel in the toilet. He went to the doctor several times asking why he didn't feel the stones passing like he did before. Still haven't had the heart to tell him I am the reason he spent a couple of...
Good thing because when the Li batteries off gas they emit high percentages of hydrogen, and compounds of hydrogen, including hydrogen fluoride, hydrogen chloride and hydrogen cyanide, as well as carbon monoxide, sulphur dioxide and methane.
Or bury it in sand.
The thermal runaway and off gassing that happens just proliferates the fire far past what we can control with the usual firefighting techniques and equipment.