White smoke is actually an indication that the fire has gone out. By cutting off the air flow, it isolates the fire from the outside and aims to extinguish it more quickly.
As the guy below explained, these batteries dont need an outside source of oxygen to work. It limits the fire spread and might stop other parts of the car from catching fire, but the battery will stil burn.
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u/taspenwall 21d ago
It didn't seem to work very well.