Any compressed gas fuel is inherently dangerous. There's a video of a CNG-fueled bus falling off a lift and sending a fireball through the maintenance facility.
replyBatteries have some of these same risks: they store a lot of energy and it can be released very quickly under the wrong circumstances.
Which is why we generally don't use highly volatile fuels in vehicles, like I just said?
replyAnd, no, batteries can have outbursts but they're nowhere near as catastrophic as compressed, explosive gases or an antimatter bomb.