[cellular]

Just hang the batteries over the water in containers. Dip them into water if they catch fire.

[darth_avocado]

Electric battery fire is not exactly extinguished with water.

[Maakuth]

This is largely a misconception that's caused by the fact that EV fires are hard to extinguish with normal water sprays. That is because the bettery packs are designed to be water proof, so it is hard to get the fire patrol's water in. If you can immerse the pack in water, the fire is extinguished without much trouble. That's unlike petroleum fires, where the fuel is lighter than water and liquid, so water spray will boil and spread the fire instead of extinguishing it.

[Qwertious]

It doesn't need to be extinguished, it just needs to be removed from the ship. Even a second of airtime (and a healthy lateral velocity) might be enough that the ship is out of the explosive radius of the battery.

[PunchyHamster]

sure, and what you do with remaining 499 burning containers when your crane is dipping the first one ?