Firefighter/EMT here. Our department has trained on hybrids (don't cut the big orange cable!)[0] but not electric per se. Doesn't matter. Unless there's someone in the car, we're going to stand back, let it burn, and keep it from spreading.
Cars contain bigger hazards than batteries: Airbags are basically bombs, and gas lifters (the things that make the hatchback open smoothly) can become missles in a fire. And that bit about cyanide? Ha! When your sofa catches on fire it releases cyanide. That's why we wear positive pressure SCBAs.
[0] We typically cut battery cables on conventional cars to lessen the danger of an airbag exploding in our face during a rescue.
Cars contain bigger hazards than batteries: Airbags are basically bombs, and gas lifters (the things that make the hatchback open smoothly) can become missles in a fire. And that bit about cyanide? Ha! When your sofa catches on fire it releases cyanide. That's why we wear positive pressure SCBAs.
[0] We typically cut battery cables on conventional cars to lessen the danger of an airbag exploding in our face during a rescue.