`Vape pen battery spontaneous ignition`

Holman cites his own consulting work on vape pen fires as a class of cases parallel to phone-battery fires.

Yes. And not only that — I've worked on some cases where you have phones catching on fire, but a lot of people do the vape pens. They think it's a safer alternative to smoking. The vape pens have the same issue: they can spontaneously ignite. You get what's called thermal runaway on the battery.