I have been following reports of cars igniting spontaneously, and so far the general finger-pointing has been directed towards the after market wiring/hids/etc.
However, there is another possible culprit here that comes to mind. Most of you would be aware of the Galaxy Note 7 battery fiasco that endured for the better part of last year...in that case it was discovered that the Lithium-ion batteries were densely packed and because of certain design choices resulted in some malfunction/rupture which set the battery on fire. The burst was intense enough to burn holes through the casing and sometimes even damaged surrounding areas.
Now I am no expert on the chemistry or physics of it all...but could the use of some types of DRY Batteries be of concern here? Look at the evidence....in both the cases of the Galaxy Note 7 and these cars, the problem has become increasingly common just in the last year....in both cases the burns were severe enough to damage metal. It would be interesting if someone more knowledgeable could comment on the cases of dry batteries and safety concerns?