One of my smaller water powered motors powered by a water battery. It was once upon a time a motorized solar rotating stand. Which I replaced the solar panel with a water battery, as they supply power for years. I ran it for 5 years non stop as a test and made a video on it. Then when the gears started to sound a bit loud in it after 5 years, I removed all the gear work but kept the motor and circuit board. And made another video so the motor itself is now powered by a water battery. The video is https://www.youtube.com/watch?v=i03JrimN9J4 (https://www.youtube.com/watch?v=i03JrimN9J4)