If you containerize batteries (which is a thing with some electric ships already), swapping the containers is a few minutes work. Most container harbors routine

If you containerize batteries (which is a thing with some electric ships already), swapping the containers is a few minutes work. Most container harbors routinely process container ships with thousands of containers using automated cranes, autonomous ground transport, etc. I don't think that's a process that takes a lot of time. They probably measure that in numbers of containers per minute. So, I think that we can establish that swapping a few batteries should not be that big of a deal technically. Recharging those containerized batteries would require some infrastructure. Conveniently, off shore wind parks are currently pretty popular, can generate lots of GW of power, and can be close to shipping routes. There are all sorts of solutions that you could imagine here. You could even shuttle batteries to and from ships that need them so those ships don't even have to make an expensive detour.