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WeinCell MRB625 - PX625 / PX13 Non-Mercury Replacement


Type: Zinc Air. Voltage: 1.35 V.

Diameter: 15.6 mm. Height: 5.95 mm. 

Price: 5.50 each. 5.10 each if you buy two or more. Postage and packing included.

1.35 V Replacement for: PX625 / PX13 / H-D / MR9 / KX625 / RPX625 / LR09 / PX625A / D625 / EPX625G / V625U / KA625 / RPX625A / V625U / EPX625BP / HD1560 / EPX625.

The Wein Cell MRB625 is a 1.35 volt non-mercury battery. It is designed to replace Mercuric Oxide PX625 and PX13 batteries and is commonly used in cameras and exposure meters. The Wein Cell MRB625 can be used in the Nikkormat F, Canon F-1, Leica M5, Olympus OM-1, Minolta SRT, Pentax Spotmatic F, Gossen Luna-Pro, and many more. 

The Wein Cell MRB625 has a distinctive appearance with its 'stepped' concentric disks. 

The WeinCELL MRB625 is a custom zinc/air battery designed to replace banned mercury batteries. Unlike 1.5v alkaline replacements such as the LR9 whose unstable output can produce exposure errors, WeinCELLs deliver the same 1.35 V voltage and stability of output as did the mercury batteries. In contrast to hearing aid batteries which only last 1 month, the WeinCELL MRB625 batteries last much longer, some times up to a year. To achieve this longer life, the MRB625 used a proprietary electrolyte and has only two small air holes, rather then the 7 larger holes found in standard hearing aid batteries.

To use the WeinCELL MRB625, the adhesive tab must be removed. This allows air to enter the cell. After about 30 minutes, the MRB625 is fully activated and ready for use.

There are special considerations for Gossen Lunasix lightmeters. See our Frequently Asked Questions here...

An alternative mercury free replacement for the PX625 is the silver oxide S625PX. These S625PX cells produce 1.55V which is higher than the 1.35V produced by the original PX625 mercury cell. Because the S625PX 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.

The "Rolls Royce" mercury free replacement can be used again and again is the MR-9 Adapter which contains micro electronics that drop the voltage from the silver oxide cell to the 1.35 Volts that your  camera was designed for. No adjustment or modification to your camera is required. The MR-9 Adapter does not require activation or a supply of air. The MR-9 Adapter and silver oxide 386 cell has a significantly longer battery life than the zinc air WeinCELL MRB625 batteries.


The WeinCELL MRB625 battery is probably the most straight forward solution to replacing the PX625 and it has a shelf life of up to ten years. Why not buy two or more, take advantage of our reduced price and make sure you are not left without a camera next time your battery runs out.

* Actual manufacturer may vary depending upon availability

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