For short haul (think ferries) the same calculations will make electric ships feasible when distance travelled is 1 or 2 order of magnitude less. Such ships already exist.
Here's a larger ferry connecting Sweden and Denmark that was converted to hybrid with the goal to not use any diesels in regular service. Has 4 160 kWh battery capacity, one trip takes 20 minutes and uses 1 175 kWh.
https://www.youtube.com/watch?v=UyWcY4bTdl8
A company specializing in it is https://corvusenergy.com/