I may be wrong, but I think large cargo ships usually go fairly long distances between docking, so they would still need a lot of battery- batteries that may be

I may be wrong, but I think large cargo ships usually go fairly long distances between docking, so they would still need a lot of battery- batteries that may be better deployed elsewhere for the time being. What might work, maybe, is to have re-battery-ing ships that could be deployed along the route to meet the cargo ships and replace the batteries while en route. I have no idea if this is feasible... but it sounds like it might be worth exploring if I had an investor/partner with the billions it would take to develop...