So long as vehicles contain a supply of “stored energy” there will be events where that energy is released in a more or less immediate and uncontrolled way.
Electrical fires tend to remain seated where the energy is stored. Gasoline fires spread across the surface and kill people.
During the same week there have been a great many more fires started by accidents to vehicles powered by liquid fuels. Indeed, if today someone wanted to replace electric cars with cars fuelled by a liquid such as gasoline, it would be immediately prohibited on safety grounds.
This was not good PR for Tesla or the near future of electric cars. The photos and one video that I have seen showed the fire mostly isolated away from the cabin. It's a shame that the few incidents have made enough news to cause investors to sweat.
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