Aha! an article on electric buses and the possibility of fire.
https://www.intelligenttransport.com/transport-articles/19587/bus-fire-safety-battery-systems-electric-buses/
There have been a few bus fires with certain brands of Chinese buses. At least five times this has happened. On the other hand there were two buses that caught fire and were destroyed on the same day in different parts of Rome. These were diesel powered.
You pays your money and you takes your choice.