[enchiridion]

Depends on your definitions. Is the water pumped considered part of the battery before it’s elevated?

[jermaustin1]

The pumping of the water would be "charging" the barrel of water, I guess.

[einpoklum]

I'm sure this will work great for powering an aircraft, too. You could just let it all hang from an anchor at the highest point in the battery :-P