WEINCELL (MRB675), Replacement (12-Package master carton) Wein Cells are the
only mercury-free, exact-voltage replacements for discontinued 1.35 volt
mercury photo batteries. The zinc/air composition of the WeinCell delivers the
same precise voltage with steady, constant output identical to that of the
mercury batteries (alkaline replacements are generally 1.5 volts, with an
unstable output curve this can result in exposure errors of up to 2 stops).