Someday they’ll get around to perfecting the nickel-iron battery, aka “Edison battery”. Yes, THAT Edison:
https://en.wikipedia.org/wiki/Nickel%E2%80%93iron_battery
I wonder what the effect of nano particles which greatly increase surface area without increasing size or weight on that type would be?
“What do you get when you put an Edison battery in a Tesla?” sounds like a joke in search of a punchline.