Why dont we just use flooded batteries and regulate it to overcharge them a few volts.

We can build electric/hydrogen powered cars.

Plug them into a power outlet each night.
Overcharge them so their voltage is good and collect the hydrogen thats resulted from them being fully charged.

Drive them on electric power then when it runs out, switch over to the storged hydrogen.

Top up the water level in the batteries every few days and good to go.
Its so so easy.
Im off to hide now.