So, I know that battery powered planes aren't practical, because there just isn't enough power to weight. However, What about an airship? Airships don't have to move to stay aloft.
How would this work for a realistic airship with a big baloon filled with hydrogen or helium gas?
I specified a liquid-metal battery because I just learned about them, and I've been told they have a higher power output than lithium-ion batteries and without degredation over time (here's more on the subject: https://news.utexas.edu/2020/07/06/new-room-temperature-liquid-metal-battery-could-be-the-path-to-powering-the-future/), but if there's a better means of power storage available, I'd like to hear about that, too.