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!