Summary how to revive Konica Autoreflex TC (aka ACOM-1) alive without obsoleted mercury batteries.

WeinCell MRB625 (which replaces PX625 and PX13) zinc-air battery is very convenient solution, but they deplete even if not used. The first and only pair lasted operational almost six months. You can purchase those from their web site or from Mediajoy in Japan. It was a reasonable investment to verify that my old Konica works (it did).

Kanto Camera Service's MR-9 adapter for SR-43 (silver oxide 386) batteries is a longer term solution. Available from their web store in Japan and from C.R.I.S. in the US. Scan of the sales package and instructions is here.