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The MR-9 adapter uses a Zener diode to reduce the voltage, if I am not mistaken. The electronics actually require a minimal current drain to function properly. See here:
The mercury oxide battery problem, at Konica SLR system, providing information about the PX625 and PX675 battery that is not specific to Konica models If the Pentax you are referring to is a Spotmatic F, it should have bridge circuits that compensate for the extra voltage of Silver Oxide batteries without compensation (best not to use alkaline batteries)... if there is a discrepancy between your Spotmatic F meter and another source it may be due to other factors. The PX625 is a small button-shaped 1.35volt mercury battery which a great number of camera models were designed to use. Unfortunately, they are either very difficult to find or very pricey. Alkaline batteries have an unpredictable drop off in voltage over their life - they start off at 1.5v, but will end up well below 1.35v. Because of the bridge circuit the spotty should be better placed to deal with this than other brands, but I'm not sure if it can compensate for low voltage (others may be able to confirm).
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the factory are no longer available in the US. I had read online different possibilities. Different people had different opinions. While many said which battery solution was best, and gave general factor that must be considered in your choice. I personally removed it from the equation by factoring in the The following is a very economical way to power these cameras at 1.4 volts, close enough to the original spec to give good meter readings. Voltage - the voltage of the mercuric oxide cell was 1.35v, the voltage of many of the popular alternatives is 1.5v or so I am curious why there are so many many posts on the Internet on how to make substitutes for the Mercury PX625 batteries. If you consider camera cost, the lifetime cost of film, chemistry, etc.. that you will pay with this camera is it important to save a couple dollars/euros/pounds on a light meter battery?
The adapter is made of high-quality brass and features a large air hole for improved battery activation. It is also compatible with a wide range of cameras, and Vintage Light Meters. A detailed list of compatible cameras can be found below, see description. And finally, the moment of truth… The MR-9 battery adapter giving the Leica MR-4 the correct voltage. slightest of possible delays at some shutter speeds. Both went to my long time repairman for a CLA (Clean, Lube, & Before the manufacture of mercury batteries was banned, many cameras were designed to use them. Because mercury batteries produced a constant and reliable voltage, many cameras were built without any voltage regulation in the metering circuitry. Unless preventative measures are taken, use of other kinds of batteries gives erratic exposures and meter readings. Another mercury PX625 replacement is a zinc air battery. The WeinCELL MRB625 is a custom zinc/air battery designed to replace banned
RPX625 / RM625 / KX625 / HD1560 / 1124MP / Mallory RM-625R / Eveready E625N / Burgess HG-625R / 4370 / 4371 / V13PX / EPX13
thank you Wikipedia) or the battery would discharge itself (down to 1.35v) in the adapter regardless of whether it was installed in a camera? And there doesn't seem to be either the space or the spare voltage for a more complex circuit. Minolta you can adjust the film speed ring by 1/3 of a stop. By understanding how the battery functions in your camera, Zinc air hearing aid batteries have a flat discharge curve and a lower voltage of 1.4v -1.45v. Therefore it is possible to use these with the adapter above as a replacement for the 625. The downside is that zinc air have a relatively short lifetime of around a month, and can discharge blue goo when then are used up.Plase note that this adapter cannot change the voltage of the battery. (though some very expensive ones do: they have a chip that can adjust the voltage. I don't think it is worth it) This copper-made adapter can convert a LR44 battery or 675 zinc-air battery (also known as hearing aid battery) into a PX625. I recommed using a 675 zinc-air battery because its voltage is 1.4v, which is very close to the voltage of PX625, while the volage of LR44 is 1.5v. The light meter is more accurate when your battery has a more appropriate voltage. That is one advantage of using an adapter+hearing aid battery over using a LR625. oxide cells to the 2.70 Volts that yourlight meter or camera was designed for. No adjustment or modification to your changes in the lighting between test shots. I did not use a studio setting for the tests. Exposures were conducted in the daylight, ensuring that no cloud almost exactly in sync with only minor differences in a couple of spots. I think that this can a attributed to some differences in the
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