Wein MRB400 Battery

SKU #:99012 MFR #:990-124
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Wein MRB400 Battery
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Wein MRB400 Battery

WeinCells 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 discharge curve with steady, constant output identical to that of the banned mercury oxide batteries (alkaline replacements are generally 1.5 volts, with an unstable output curve; this can result in exposure errors of up to 2 stops).

These environmentally friendly batteries are compatible with any camera or meter specifying the listed mercury battery. Voltage output is more stable than alkaline replacements. No camera/meter adjustment or adapter required.


  • Compatible with any Pentax camera specifying RM400R or V400PX mercury cells.
  • Voltage output more stable than alkaline replacements.
  • No camera adjustment needed.
  • Environmentally safe.
E400N, EPX400, H-B, KX400, MRB400, PM400R, PX400, RM400, | T400N, V400PX
Zinc Air
Output Voltage:
1.35 VDC