For what it's worth
I have SRTs and some other cameras the were built for mercury cells. The Wein cell is a zinc air cell.
What works for me though is Walgreen's 675 Premium Zinc Air hearing aid batteries. They put out 1.4 volts. They have a smaller diameter than the Weins. Take your camera to the car parts or hardware store and get an O-ring to fit inside the battery compartment and surround the 675 cell. This set-up works great for me.