"How many of these are carried on fire trucks?"
Seriously? To answer directly, probably none right now. But I don't hold a hose, mate.
Maybe this will help:
Or, even this:
Considering F-500 is an all-round great performer, and not exclusively for lithium-ion battery firefighting, it's not a great stretch to suppose that firefighting will retrofit existing equipment in due course:
https://hct-world.com/products/chemical-agents/f-500-encapsulator-agent/why-f-500-ea-is-economical/
Pictured: me hosing down another one of Happy's little fires with F-500
