What is happening?

What to do

1. Leave now. Call from outside and report the battery.
2. Child/person needing assistance: accompany only along safe exit, no re-entry. Unable to escape: give exact location/mobility to rescue. No improvised rope/unsafe stair carrying.
3. Do not touch/move smoking battery or approach to unplug. Apparently out: no return until firefighters clear. Reignition possible. Device blocks exit: trapped guide, no passing fire.