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this post was submitted on 11 Jun 2024
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Yes but no. Chemically pure lithium reacts vere energetically with water. The stuff in batteries reacts too, but it's more like an unextinguishable toxic hellflare than an explosion. Pretty sure the batteries just keep burning under the water until the lithium is all gone.
I don't think they'll burn under water. The main reason battery fires are hard to extinguish is because at high temperatures, metal oxides in them decompose and release oxygen gas. So you can't extinguish the fire, but you can try to cool it down.
This deck on the NASA website illustrates that very little oxygen is released from a single cell
Per this video:
Submersing it in the ocean would probably cool it very quickly and put it out.
Thanks for the explanation