I did.

I am well aware that they have fires and explode. Did my comment imply otherwise? It did not.

To answer your question, I think that if one e-bike-sized battery explodes three feet from other batteries then the fire has a very low probability of spreading directly to the other batteries. This is because the outside of these batteries are much less flammable than combustible substances like wood. I doubt that there is a single instance of one e-bike directly igniting another e-bike without the fire first spreading to the surrounding structure.

EDIT: I see that you edited your comment and added the sentence: "This is why newer buildings are moving towards fireproof bike rooms". You see that that contradicts the rest of your comment and supports mine, right?