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1kg * c² = 24 TWh.

Supposing a Tesla averages 200Wh/km, then it would drive ~ 10¹¹ km (4 light-days, or around 600 times the earth-sun distance... which is a lot)

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At least in the medium-term future we would at most be able to use is Hydrogen->Helium which would yield 6.45 x 10^14 Joules [1] which is equivalent to 179 GWh which at 200Wh/km would be 8.95*10^8 km.

That's still enough to go 20.000 times around the globe and longer than any car is known to have lasted so far[2]

[1] https://www.phys.ksu.edu/personal/wysin/astro/review9/p4.htm... [2] https://en.wikipedia.org/wiki/Car_longevity

If Wolfram Alpha is right, then 10^11 km is 2 million times around the earth:

https://www.wolframalpha.com/input/?i=10%5E11km+%2F+earth+ci...

Shows the potential of batteries. Charge your one kilo batttery to drive around the planet two million times.

It would be a misnomer in common parlance to describe nuclear fuel as a battery (mass > energy conversion). The broader language to describe this is ‘energy storage.’ E.g. oil is stored solar energy over millions of years, batters are stored electrochemical energy, flywheels are stored mechanical energy, etc.

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