Talk about a funky footprint. China’s first all-electric cargo ship, a 229-foot, 2,204-ton behemoth powered by more than 1,000 lithium batteries, is ready for a test run — transporting, of all things, coal. The ship is due to begin its regular route early next year, supplying a power plant along southern China’s Pearl River. It can haul 2,314 tons of coal 50 miles before charging up during cargo transfer. That’s hardly ocean-worthy, but a Norwegian cruise line plans to launch a hybrid-engine vessel next year.