https://theconversation.com/what-causes-lithium-ion-battery-fires-why-are-they-so-intense-and-how-should-they-be-fought-an-expert-explains-214470
> In the case of up-and-coming solid-state batteries with a lithium metal anode (instead of the more common graphite anode), these have a rather unwelcome talent for chemical reactions when they come into contact with water.
> Instead of snuffing out the flames, water could actually fuel the fire and cause it to intensify. This is because the water’s reaction with the lithium can produce flammable hydrogen gas – adding more of a hazard to an already perilous situation.
> While firefighters have used water on lithium-battery fires in the past (as it can help with cooling the battery itself), they have at times needed up to 40 times as much as a normal car fire requires.
> Water also conducts electricity, which means spraying it on a battery fire could lead to electrical shocks or short-circuits if the battery is not electrically isolated.
