I mean it’s a press release. Those don’t cost anything.

The only application of this that seems half feasible is maybe some kind of post-disaster recovery where for whatever reason you’ve ruled out using a generator.

Even then you'd probably be better off shipping a mixed load of diesel trucks and large generators.

Maybe they plan to swap batteries in and out of the ship, have a rotating set of ten (or whatever) batteries, one discharging, eight charging, load the tenth with a crane, swap out for the discharged one, cycle through...

No, I watched their video and it says the batteries are meant to stay on board.

There are lots of grid scale battery companies, A123 was one, that were (still are?) Building giant battery packs into shipping containers as a way to store and deliver energy to the power grid during high/low cycles. One could conceive of just using those and loading and unloading them just like standard containers on a ship.

If we cared about shipping energy, we'd just use our Nuclear-powered ships.