I use an MS76 Silver-Oxide cell as a PX675 replacement. If you buy a PX28 Silver Cell you can open it up to reveal 4 MX76 batteries. I use them in the Konica C35 without problem. I have only two genuine PX675 left, saving them for my Argus/Cosina STL1000.
The PX625 and PX13 are the larger cells, and have an alkaline and Zinc-Air replacement. I bought about 50 PX13's ten years ago and only the Kodak batteries dies due to age. The Ever-ready and Duracell batteries are all still working. If you come across a PX14 at a camera show, you can take off the paper to reveal two PX13's. If the camera does not have a REAL off setting for the meter, I take the battery out when not in use. The Canonet's switch off the battery when in manual mode. The Konica S2 and Minolta Hi-Matic's do not. Even with the lens cover on, and the CDS cell on the dark, a slight trickle of power gets through them. This will kill a battery in ~1 Year. I have some 25 year old Mercury Cells that are still going strong in my Nikon F Photomic.
The Moon. Must have been all of those Apollo guys with their NASA Nikon F. Nice 55mm F1.2 lens, out of this world.
