Battery based on aluminium theoretically can have much better capacity than lithium both per volume and per weight. But it is much harder to make batteries from

Battery based on aluminium theoretically can have much better capacity than lithium both per volume and per weight. But it is much harder to make batteries from it. Still there were a progress of making non-rechargeable fuel cells based on aluminium. As aluminium is safer to handle even compared with gasoline, loading/unloading few bars of it from a car should not be a problem.