The batteries I hear about being unstable, catching fire are the e-bike batteries. Perhaps cheap construction or they get knocked about during use.
One e-bike battery overheated...the fellow was taking it outside to cool off and it exploded in the elevator on the way down.
There are many stories of EVs catching fire, several of which were inside an attached garage. These were not cheaply made vehicles - they include Teslas & city buses.
This article says that Hybrid vehicles have far more fires than pure EVs & ICE vehicles.
https://caredge.com/guides/hybrid-car-fires