Electric vehicle batteries in parking garages that are flattened would burn.

[ProfessorGAC]

45. Not Accurate

First, reactive metals don't explode due to contact with atmospheric moisture, or even liquid water flowing across the surface.
The explosive potential occurs in a submerged condition where liberated hydrogen gas has no where to go, Tue autoignition temperature is reached and the energy of substantial H2 burning is released rapidly.
Those condition don't apply in your scenario.
I've thrown reactive metal into water. It's exciting! We see flames flickering; the water gets hot very fast, but no explosion.
Secondly, lithium still needs a source of oxygen. Unlike phosphorus, which reacts with air, but lacks the activation energy to split water (which is why is can be stored in water), lithium gets the oxygen it needs to react from the water.. It takes the oxygen & one hydrogen from the water to form lithium hydroxide (LiOH) & one atom of hydrogen. Two lithium atoms in water makes 2 molecules of LiOH & one molecule of hydrogen (H2)
Absent water, lithium reacts directly with oxygen to form Lithium Oxide. (Li2O). 4 lithium atoms and one oxygen molecule make 2Li2O molecules.
Lithium in kerosene or mineral oil, seeing neither water nor oxygen is completely stable.
It DOES require oxygen to ignite.