A big battery "fire" is not really a fire, in the normal meaning of that word.
The job the FD faced might better be described as "supply continuous cooling, until the self-powered/no-oxygen-needed battery meltdown runs low on electrical energy". Though if the FD's training & equipment is for traditional fires - then they are stuck using a "pretend it's a fire, and call in 10 more tanker trucks" playbook.
How long will it take for that to happen in one of these semis? What if the fire needs to be extinguished before then because of risks it poses to surroundings?
You're pretty much SoL, because the "fire" is more like a pair of electrical cables that are shorting together.
With seriously specialized heavy equipment (and probably an expendable robot or few), you might tap into the semi's electrical system, to drain off some of the electrical energy to a giant resistor. Or chop the battery out of the possibly-mangled semi's structure, and haul it away in a "burning battery containment" truck.
A big battery "fire" is not really a fire, in the normal meaning of that word.
The job the FD faced might better be described as "supply continuous cooling, until the self-powered/no-oxygen-needed battery meltdown runs low on electrical energy". Though if the FD's training & equipment is for traditional fires - then they are stuck using a "pretend it's a fire, and call in 10 more tanker trucks" playbook.