Unless you happen to crash into a truck carrying carbon dioxide.
They are only talking to the sheep that listen.
The fire only goes out when the electrolyte is consumed and it effectively runs out of fuel. The water only works to any measurable amount on the secondary fires started by the battery. If you can get enough water inside the pack to cool the cells and slow down the chain reaction, maybe you have a chance - but you can't get water inside the pack. So they just keep burnin'.
They can be extinguished, and have been in the past. They are a pain in the ass and take a lot of time and water, but they can be extinguished. Some newer vehicles are being made so that the floor pans drop out providing better access to the batteries. This does create additional issues, but in that case access to the batteries is not one of them.
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WWJD (What would Jesus Drive)
