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and more precisely to these two 101's. Whether you would get the same results cannot be guaranteed by The adapter is easy to use with the PR44 675 Blue Tab Zinc Air battery and simply screws into the battery compartment of your camera. 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. The mercury cell problem and its solutions (PDF file) by F. de Gruijter. Also discusses PX675 and other mercury batteries.
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 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 RPX625 / RM625 / KX625 / HD1560 / 1124MP / Mallory RM-625R / Eveready E625N / Burgess HG-625R / 4370 / 4371 / V13PX / EPX13
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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 mercury oxide battery problem, at Konica SLR system, providing information about the PX625 and PX675 battery that is not specific to Konica models Another mercury PX625 replacement is a zinc air battery. The WeinCELL MRB625 is a custom zinc/air battery designed to replace banned
In the following 3 photos you can see the MR-9 battery adapter on the left, with a modern PX625 on the right. Positive side faced up Negative side faced up with the MR-9 battery adapter empty Negative side faced up with the MR-9 battery adapter with 386 battery slotted in The LR9 is the least expensive PX625 replacement. They fit perfectly but, as with all alkaline cells the voltage is 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 cloudDischarge characteristics - the voltage of the mercuric oxide cell was fairly constant until it was fully discharged, whereas some cells (in particular alkaline) have a voltage that decreases steadily with time
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. 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. I have previously written about adapting a 675 hearing aid battery for use in cameras that require a 1.35 volt PX625. I was pretty confident at the time that since hearing aid batteries operate at 1.4v that this was the solution to this problem… I have since found out that actually, this solution is not always quite as ideal as I had originally thought. 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.Voltage - the voltage of the mercuric oxide cell was 1.35v, the voltage of many of the popular alternatives is 1.5v or so The LR625 is cheap and almost in the same size as the LR625. The only problem is that the voltage of LR625 is 1.5v, which is 0.15v higher than that of the PX625. The difference in voltage may slightly affect the light meter. But in reality, it does not matter much. cost difference between the solutions. It is close enough that each person will have to make up their NiMH rechargeable: 1.2V: may not even be possible to calibrate the meter for this voltage, and if you do it will be way off if you run out of charged--up batteries. The PX625 Camera Battery Adapter replaces MR9, 625A, MRB625, PX625, EPX625, PX13 discontinued mercury cells.
oxide cell to the 1.35 Volts that your camera was designed for. No adjustment or modification to your camera is required. TheAlso, one of the sources I found said straight out that the "CRIS" adapters just used a series resistor to drop the voltage. But it's possible that the Small Battery Company does it differently.) both equally smooth, crisp, and seemed to function wonderfully. Now to the reason for this posting. What battery to use.
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