One problem that I see is that an EV series would take away the excitement of a Nascar pit stop. Changing a battery in the pits would be far too dangerous,, and charging it would take too long. In Formula E, when the battery gets too low, the driver goes to the garage to swap into an identical second car. How boring is that?
It should be one car, go as fast and as far as you can.
Nah, hot swappable batteries would be safe. Just do it during a tire change (just like they do gas)