Lithium-ion batteries don't contain metallic lithium, so water is perfectly fine. The current state-of-the-art method for extinguishing burning electric vehicl

Lithium-ion batteries don't contain metallic lithium, so water is perfectly fine. The current state-of-the-art method for extinguishing burning electric vehicles is that firefighters use a special rig to lift the whole car into an open top container (like you use for waste on construction sites) and then fill that with water and let it sit for a few days.