I think it would be a good idea to keep on any EV. I did some testing, and a short at the high voltages we run at will cause a big plasma ball of fire. Many of us are doing wiring. The systems are untested and unproven. I remember from a Lectra diary that an optima battery (these are high-quality and expensive) self combusted. I'm also thinking of keeping some cable cutters on the bike. BTW, ALWAYS have a fire extinguisher handy when doing any kind of work on any EV!
I'm going to mount an automotive fire extinguisher on my bike. I'll also have one for the civic. Amazon carries some if you search "fire extingusher" under automotive. It needs the following ratings:
B: Flammable Liquids, C: Live Electrical Equipment