Yikes. And it is an intense heat too. Maybe because the lithium in the battery.
I forgot how to post pictures here but if you want to see the car, I have some pictures.
Post them up or send via FRmail.
I have yet to see a battery failure in such a device that wasn’t directly attributable to either abject abuse of the device/battery, or other conditions (such as improper charging with non OEM/out-of-spec gear).
Yeah. Don’t leave anything charging when you’re not around.