After an October accident, a burning Tesla Model S was captured on video by a passerby. That was definitely the battery. It was triggered by debris on the high

After an October accident, a burning Tesla Model S was captured on video by a passerby. That was definitely the battery. It was triggered by debris on the highway striking the undercarriage and penetrating the 6mm armour plate surrounding the battery. They had to flip the car on its side (while it was burning), drill holes into the car to access the battery packs, and only then could put it out.