Exell Battery MRB400 1.35V Zinc Air Replaces ANSI / NEDA-1116M, IEC-MR42

An Energizer E400N Battery Replacement

Date: February 13, 2014 Category: View Project
Exell Battery MRB400


Battery ModelMRB400_12
ChemistryZinc Air
Length3.6mm (0.14″)
Diameter11.2mm (0.44″)


  • PX400
  • EPX400
  • RM400
  • H-B
  • V400PX
  • E400N
  • PM400R
  • KX400
  • T400N
  • Pentax Spotmatic Camera
  • Spotmatic II Camera
  • Spotmatic IIA Camera
  • SP500 Camera
  • SP1000 Camera

Exell Batteries not only provide consumers with high efficiency, long-lasting performance, they also function as replacement batteries for an array of common and unique applications. Ranging from vintage camera equipment to sophisticated medical testing equipment, Exell Batteries can meet the needs of all consumers.

There are no alkaline cells manufactured of this size and shape.

The S400PX cells produce 1.55V which is different from the 1.35V produced by the original PX400 mercury cell. This doesn’t normally cause a problem because today’s films are very tolerant to under-exposure and because the under-exposure is compensated for during printing. (so you would have greater problems if you were using slides). If you do find you need to compensate, because the S400PX silver oxide cell produces a steady 1.55V, you are able to compensate for the higher voltage by a fixed number of stops or by adjusting the ASA setting. There may be as many as two f-stops underexposure by a camera that uses 1.55v instead of the original 1.35v, but the compensation you require is constant.

This battery model is commonly used for Dog callores,Dogwatches and Mentor Pens, from brands like PetSafe & Reichert.