It’s most typical for fires to start when the battery is being charged. For it to catch fire just sitting there either means it was damaged or was some shoddy, not-certified, battery that shouldn’t have been sold in Canada.
This could have ended up much worse.
The number of low grade AliExpress / Amazon dropship special ebikes I see on the streets is pretty high. As someone fairly deep into ebikes, it’s scary knowing how, many of those batteries are built. Shit cells, shit welds, shit BMSes, shit housings… This might require a national level import regulation to rectify I’m afraid.