Tony, you're right! I have collected so many Contax bodies I forgot I have a brown-snakeskin Yashica FX-3 deep in the camera cupboard somewhere. I'm 99% certain the battery is only for the LED meter and nothing else. Fully mechanical. I'm going to go dig it up and check. Oh, and cheap too. I paid $75 for mine and only due to its fine shape and nifty snakeskin cover. I totally overpaid. Otherwise I think they can be had for $25-50 USD usually...or cheaper.
"Well, my photos are actually much better than they look..."
My only C/Y camera is the Contax 159MM. It is probably my favorite 35mm SLR, but I don't use it as much as my Canon F-1n or A-1 because I have so many more Canon lenses. Zeiss gets expensive in a hurry!
When I want a good photo, I shoot digital. When I want a great photo, I shoot film.
Back when my dad did camera repairs, the most often cameras he saw in the C/Y mounts were 137MDs and 137MAs (plastic shutter parts would crack under heavy pro use) and RTSIIs
I guess this was due to their popularity