China floats electric container vessel

[Mart]

36 containers was in the original article.

And more importantly, quoted in your post.

I shall beat myself with birch branches as a form of apology.

[AE-NMidlands]

50 MWh battery.

I think it's 36 x 50 MWh batterIES.

Given that those ships (and the ports they visit) are designed to get hundreds or more containers off and on the ships in the shortest time possible, I'm not surprised that swapping batteries is integrated with the payload handling.
I read the bit which said

It’s not going to run all the way on batteries it carries onboard, of course. Battery energy density is increasingly good and will be multiples of today’s in the coming years, but steaming 1,000 km upstream, even in the 3.6-kilometer-per-hour average water speed of the Yangtze, is a huge energy requirement. It doesn’t have to, as there are 30 container ports along the 2,700 kilometers of navigable waterway (about twice the length of the Mississippi and three times the length of the Rhine).
And 36 containers of batteries will be dispersed through those ports in some undoubtedly optimized pattern to allow the ship to slip into a berth and then winch depleted batteries off and charged batteries on.

as meaning that the power for the planned whole river journey will be achieved by "refuelling" en route.

[Mr Gus]

36 containers was in the original article.

And more importantly, quoted in your post.

I shall beat myself with birch branches as a form of apology.

Why? when you have a perfectly good bargepole Mart? (good for a few hard whacks I bet)

[Mart]

36 containers was in the original article.

And more importantly, quoted in your post.

I shall beat myself with birch branches as a form of apology.

Why? when you have a perfectly good bargepole Mart? (good for a few hard whacks I bet)

Too unwieldy, and Wifey said she wouldn't touch me with it.