Ok I read it quickly, but it seems like the fire was in the Frunk and the batteries are under the cabin. That makes it seem like it's just a normal electrical

Ok I read it quickly, but it seems like the fire was in the Frunk and the batteries are under the cabin. That makes it seem like it's just a normal electrical fire - probably from something getting shorted after he drove over 'metal debris' - and not anything specific to the batteries. If that's correct this is unfortunate for Tesla as even gasoline cars (and certainly hybrids) can have an electrical fire after hitting something. Either way it was bound to happen eventually.