"Water Powered Cars or Hydrogen/Oxygen Powered Cars, using 100% water as fuel is real. By splitting water by electrolysis and creating hydrogen/oxygen gas, you can replace gasoline"
"Hydroxy gas can NOT be stored this way, it is too powerful to store in a tank. You make the Gas as you drive. Your alternator generates amps to run your stainless steel plate cell under the hood. You make the gas as you drive."
http://waterpoweredcar.com/
"The battery is charged by an alternator on modern cars"
https://www.howacarworks.com/basics/how-the-charging-system-works
"Hydrogen produced by electrolysis using electricity"
"Hydrogen, obtained through renewable sources, is one of the zero-emissions fuels to power vehicles."
https://www.cummins.com/engines/hydrogen
Battery = Renewable Power Source
"The BMW Hydrogen 7 uses hydrogen as fuel differently from fuel-cell-type vehicles. When in hydrogen mode, it injects the hydrogen directly into the car’s air intake manifold (similar to nitrous oxide injection) to be combusted in the engine’s cylinders rather than converting the hydrogen’s energy into electricity to spin electric motors like a fuel cell. BMW says this is a more efficient use of the hydrogen."
https://www.bmw-tech.org/wiki/BMW_Hydrogen_7#google_vignette