Nissan Starts Selling Portable Power Source with Old Leaf EV Batteries [2023]

They're using the wrong voltage for the calculation. The nominal voltage for a Leaf module is 7.5 volts. So one module would have 7.5 volts * 64 amp-hours = 480 watt-hours. So this device would have somewhere below 960 watt hours.

I won't even bother to point out the other error, just dropping this here...

"That’s 28,160 watt-hours (or 28.1 kilowatt-hours) at a nominal voltage of 220V or 14,080 Wh (14 kWh) at a voltage of 110V."

1st gen Leaf batteries are NiMH, not lithium based. You'll be lucky to charge your GodzillaMax phone 3 times with one of those.

I was going to say ...

(I got as far as lithium - at least - something did not quite add up ...)

no way a 14kg battery can store 14kWh