Quote Originally Posted by madgardener View Post
My Konica Autoreflex TC uses 2 batteries, Stacking them blocked the air holes and I didn't get a current. I ended up buying 2 adapters so I can use the hearing aid cells. All the adapter is, is a cleaned out alkaline px13, which leaves a hole for the hearing aid cell. It works very well in my Konica. Why did I buy the adapter? Because I don't want to mess with the chemicals in the battery, it was worth it to me to buy them already cleaned out.
The hearing aid cells are slightly thinner than the PX13. In some battery compartments, they don't make contact when stacked. I use them in my Gossen LunaSix and Nikon FtN meter prism, with 3 of the four holes blocked as described above.