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Author: admin, 15.06.2015. Category: How To Stop Ringing In Ears Home Remedies

If you have you bought other hearing aid batteries in the past, use this chart to find the right Rayovac battery for you. Rayovac offers you performance, quality and consistency which in turn gives you peace of mind. If you have questions about the correct size of hearing aid battery to purchase, see our Battery Conversion Chart which can help you select the correct battery size of hearing aid battery by color code. You must have JavaScript enabled in your browser to utilize the functionality of this website. I concluded that the easiest solution for most people is to substitute an inexpensive #675 hearing-aid battery (with a spacer ring if needed to fit your battery compartment). While Wein cells are indeed effective for this, photographers have often speculated whether there is anything special about them. The Wein replacement for a PX13 or PX625 battery does have some physical differences from a 675.
The Wein battery has the same dimensions as the 675 hearing-aid size, but adds a metal ring crimped around it. I have no insider knowledge of how Wein produces these batteries; and my only test equipment consists of a simple Radio Shack multi-meter. Yet I made some curious discoveries about the voltage of zinc-air batteries (of both types), which photographers using these cells ought to know about. While researching my earlier post, I became curious exactly how much current a typical camera meter circuit was drawing. It was more convenient and accurate to use a simple resistor rather than a camera as my dummy load when comparing batteries.

But in fairness, we should note that even this solution can give different voltages depending on the specific diode chosen, and the current draw of the meter circuit.
Given all these uncertainties, I continue to feel hearing-aid batteries are the most sensible real-world mercury replacement for many photographers. Hi Mike, an extra few tenths of a volt pose no danger of frying the meter—it’s just an accuracy issue. The short answer is that a zinc-air hearing aid battery (or a Wein cell if you care to pay the extra price) will be fine, *if* you turn on the meter and uncap the lens a few minutes before you start taking meter readings. BatteryPlex would be happy to help you at any time if you do not find the hearing aid battery size or brand. Carefully remove the battery from your hearing aid, look at the number printed on top of the battery.
The hearing aid industry standardized battery sizes and came up with a color coded system to help you remember your battery sizes.
Mostly hearing aid batteries are made with Zinc Air, which means battery works by mixing Zinc with outside air. This can be important in making electrical contact with some battery compartments, for example the metered Yashica Mat models. By making temporary connections to the battery compartment of my Olympus OM-1, I found that with its meter needle centered, it drew roughly 0.2 milliamps from its PX-13 mercury cell. The voltage of a mercury or silver-oxide battery scarcely changed when put under this load—a drop of maybe 0.005 volts.
Far more significant for accurate exposures is that you turn on the meter several minutes before taking a reading.

By introducing this small voltage drop, a very close approximation to the mercury battery voltage can be obtained. When you go out shooting, switch on the camera, uncover the lens cap, and leave it that way. Then browse from our selection of hearing aid batteries by brand names like Energizer, Rayovac and UltraLast. If you are having shorter battery life, your hearing aid may not be working properly and should be looked at.
With either zinc-air battery type, the voltage will be too high immediately after turning on the camera—possibly leading to underexposure. Frans de Gruijter discusses both these factors at some length in his definitive battery-adapter article downloadable here. Once you become aware of this effect, you will definitely notice your needle drifting for the first few minutes, even when metering a scene with unchanging light.
Different brands may so other letters before or after the numbers, but those are all arbitrary letters.

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