Exell MRB400 1.35V Zinc Air Battery Z400PX PX400 EPX400 RM400 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:the equivalent silver oxide cell, the S400PX.the equivalent zinc air cell, the WeinCELL MRB400.There are no alkaline cells manufactured of this size and shape.
I installed this into a vintage Pentax clip on cds meter from 1968. For some reason the battery seemed to be too thin for this application as the battery was unable to make complete contact. I simply used two thin washers as shims and it works perfectly. It great to be able to bring these vintage equipment back on line. This would not be possible without this battery. I am very pleased with this product.
Rather than wasting time shopping, it was much more convenient to order online and have it delivered to my door. The battery was exactly what was needed and is of high quality.