"at least one of the companies plans to say that consumers who repair their own phones could cause lithium batteries to catch fire."
Yeah okay... explain Samsung's problem's in brand new phones then? What about changing the batteries in my smoke alarm? It happened a few years ago to me... put in a brand new 9 volt alkaline ... about 3 hours later I needed a new smoke alarm because it was smoldering. Any battery can go into thermal run away and vent. Lithium's just do it with spectacular fashion usually.