Couldn’t a camera for that time just transmit instead of store on reel-to-reel? Anyway, I was a kid then, and we had a camcorder that could record to tape. We have a lot of old home movies from the time. It was small, and didn’t require a lot of power.
You mean record to a video cassette tape or to a 1” reel to reel video tape?
Video cassettes that fit into a video camera were not invented as of Apollo 17.
Huge 3/4” video cassettes (they are like ten inches long, three inches in depth and six inches wide) were invented around 1970, but they were used strictly in huge recording machines in TV studios, not in the camera itself.
The point is, video cameras c.1970 were not battery powered.