It was film. You need a projector to watch it. I don’t know how it worked exactly but these are home movies made in the 1960’s using a small video recorder. If I’m lying then I must be part of a NASA conspiracy. They’re not paying me enough, though.
So it was a home movie camera? I have a lot of them. They would take a small battery for super eight. Film cameras need next to no power at all. I even have a 16mm film camera that you just wind up, like an alarm clock, with a spring mechanism.
We are discussing video cameras, color video cameras, on the moon... video cameras require much more energy because their image is made electronically, not optically by just opening the shutter and letting in light.
And the battery technology was just not happening circa 1970... for video cameras. Or their recording machines for the video tape. (Again, VHS or Betamax tape cassettes had not yet been invented).
https://www.youtube.com/watch?v=kSVrfw3znds
"Pay attention at 2:00 and 6:40 especially, then I’d like to hear your explanation of why the buoy did not go over the horizon or drop out of sight with the curve."