This is a voltage adjusted zinc-air cell and will provide the same voltage as the original mercury cell.

An alkaline cell will not work correctly in an unmodified camera and could cause inaccurate exposures.

WeinCell™ Mercury-free Replacement Batteries – new life for your old camera!

WeinCell is a revolutionary new zinc/air battery designed to replace environmentally-unfriendly (banned) mercury batteries.

Phototronics in Popular Photography Magazine 1995

Because of their extremely stable output curve, mercury cells were used in many cameras and exposure meters to ensure the most accurate exposure reading possible. But the disposal of mercury batteries has become an environmental problem, and an increasing number of states and other governments are responding by prohibiting the cells altogether.

Alkaline replacements don’t do the trick

Several battery manufacturers now offer alkaline batteries as replacements for their discontinued mercury cells. In most cases, the replacement does not have the same voltage as the mercury battery it is replacing (usually 1.5V instead of 1.35). And, the unstable output inherent with alkaline batteries can result in exposure errors up to 2 stops! Only WeinCells deliver exact voltage and stable output consistent with mercury batteries.