A battery is something entirely different than a fuel cell. A fuel cell decouples capacity, power, discharging and charging, which is usually done by a differen

A battery is something entirely different than a fuel cell. A fuel cell decouples capacity, power, discharging and charging, which is usually done by a different apparatus/ machine. A fuel cell is more interesting for longer applications, where you would build diesel generators, "peaker" power plants, seasonal energy storage. (E.g. you would produce a lot of sodium in the summer and react it to sodium hydroxide in the winter. In the summer you would recycle it back to sodium to store energy for the winter.) It should btw. be possible to transport sodium using very similar ships that nowadays transport crude oil. You could also transport sodium on pallets in colder climates as it is solid < 100˚C.