The PX400 is is a discontinued Mercuric Oxide coin type cell that was commonly used in cameras and is now banned because of toxicity and environmental fears. The original PX400 mercury cell produced 1.35V.
There are two possible Compatible Withs for this PX400 cell:
There are no alkaline cells manufactured of this size and shape.
Specifications
Exell MRB400 1.35V Battery Compatible With for: PX400 / EPX400 / RM400 / H-B / V400PX / E400N / PM400R / KX400 / T400N
Compatibility
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