Get an electric scooter they said ...
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A lithium battery on fire is actually 3 different kinds of fire - its a chemical fire, an electrical fire and a metal fire all in one. When the 787 dreamliner was experiencing battery fires I believe the fire brigade at Boston airport basically discovered nothing really put it out and they could only really stop it spreading with enormous volumes of foam. Basically your best bet with a lithium battery fire is to let it burn itself out and maybe put it somewhere where it can't set fire to anything else or put out anything near by that starts to burn.
And the massive volumes of foam doesn't actually stop anything, it just solves fire the one 100% guaranteed way: Vaccuum. Sufficient foam removes all air. No air, no fire.
self oxidising fires exist and I think some forms of battery fire can self oxidise
True, which does make them much harder to either strip all oxygen from, or replace all with pure oxygen. If the object itself contains oxygen in its chemical makeup, pressure needs to be maintained as well. A true vaccuum will still kill it (as opposed to merely smothering it which wouldn't work), but that's not something even the average science lab has on-hand, let alone some hick in the suburbs.