What happens to those expensive batteries containing rare-earthminerals after whom ever has used them? Do you just let them have those or do you buy them back and transport them empty or what?

Converting energy to create hydrogen is fairly inefficient and transporting it need lot of preparations and the buyer has to have magnitudes more expensive equipment to use it limiting the markets where to sell it.

Im not advocating for fossil fuels here. Im just stating why its more convinient for big oil to sell easily transportable oil barrels that can be packed in to basically free steel sheets or plastics and are easy to redirect towards whom ever pays the best.