[upofadown]

Gasoline powered vehicles are allowed in those places and they do indeed turn into an absolute inferno when they combust. Heck, they even allow compressed natural gas vehicles in those sorts of places and they can actually explode.

If we are talking malicious, releasing any combustible gas in an enclosed area can cause a building levelling explosion.

As a culture, we have gotten used to life with super combustible stuff. Batteries might actually be a significant improvement.