Quote Originally Posted by StoneNYC View Post
Deep freeze?

Do mercury cells work differently? I thought past a certain cold freeze you kill the internal battery chemistry?
I dunno. Seems to work OK for me. Deep freeze is actually a kitchen freezer at about 5F/-15C. I started out with 20 new PX625 mercury cells. Thawed out and put a new one into my 124G in January, 2004. I use that camera lightly. That cell is still good today. (Kept with the camera in a film canister at room temperature until it's actually needed.) At this rate I may only use 3-4 cells out of the 20 before I croak.

I'm not a chemist (that's PE's department), but I don't believe battery chemistry is "killed" by cold temperatures. Reactions are just slowed way down. At least no problems with these cells so far...