Tesla builds its industrial battery packs so they don't spread fire to nearby packs and are insulated such that nearby fires can't cause them to go off. It's no

Tesla builds its industrial battery packs so they don't spread fire to nearby packs and are insulated such that nearby fires can't cause them to go off. It's not exactly clear in the article, but the fire didn't spread, it's contained to a single module inside the battery "field".