[cotillion]

Fire services are learning how to deal with batteries [1] and most fire departments have had to adapt to new fire hazards as society changes over time with automobiles, high-rise buildings etc. For grid storage however it doesn't seem unreasonable to require each site to have the ability to move a burning pack somewhere where it can be extinguished.

[1] https://cfpa-e.eu/container-puts-out-inextinguishable-fires-...

[simondotau]

Moving a burning pack seems overkill and unnecessarily hazardous. Rather than moving the fire to containment, it'd be a lot safer and easier to move containment to the fire. All you'd need is a few fireproof walls stored on site which can be moved into place when needed.