> And if you're going to talk about this subject, you should also be aware of the lifespan of li-ion batteries. At some point they are also a fire danger.

only if you don't use a BMS and your chemistry has a major flaw causing uncontrolled lithium dendrites to create a short! Which practically is not a problem with modern chemistries and BMS anymore.

If my car has a battery failure while I'm driving I'll have plenty of time to pull over and get out of the car before the fire consumes it.

If my car has a hydrogen fuel cell failure I'll likely be dead before knowing anything is going on