After sending this I realized you has quoted the battery price at 75
cents each. They're obviously not Wein cells at that price.
Chuck Norcutt
On 7/17/2012 7:49 AM, Chuck Norcutt wrote:
> You didn't say if you got Wein cells or hearing aid batteries. It's
> probably plenty bothersome but you can extend the battery life by
> re-covering the air holes when the batteries are not in use. But as I
> recall uncovering the holes doesn't give you instant power. You have to
> wait a while until the batteries "boot up".
>
> I also seem to recall that Wein cells last longer than hearing aid
> batteries by virtue of having fewer air holes. I suppose you could
> reduce the number of air holes in hearing aid batteries but that would
> probably be fussy work to do so without introducing an insulator between
> the batteries.
>
> Chuck Norcutt
>
>
> On 7/16/2012 5:48 PM, Chris Trask wrote:
>>>
>>> You should read this: <http://www.buhla.de/Foto/batt-adapt-US.pdf>
>>> It will tell you everything you ever wanted to know (and maybe more)
>>> about means of working around the mercury battery problem. Zinc-air
>>> cells are discussed on page 2. Pay particular attention to the problem
>>> (and solutions) of stacking zinc-air cells because they require air to
>>> reach the holes punched into the case for air to enter. The Wein cell
>>> (specialized non-hearing aid zinc-air battery) is also discussed.
>>>
>>
>> I got the zinc-air batteries in the mail today and popped a
>> couple into
>> a Luna Pro exposure meter. I had made a nylon sleeve for the smaller
>> diameter yesterday, and the batteries slipped in as nicely as you
>> could ask.
>> Turned on the battery test switch and the needle fell inside the
>> bounds of
>> the test mark, just inside the high end. Went outside and tested on some
>> mentally known exposure levels and it came out just right. Later I'll
>> test
>> it with the spot meter attachment to see if it has been worth the
>> effort and
>> expense, as little as either has been.
>>
>> This was a lot easier than taking the meter apart and adding a
>> diode.
>> Now I just need to wait and see how long these batteries last. At 75¢
>> each
>> they're a lot less expensive than buying a conversion kit from
>> Gossen. In
>> the meantime, I have an idea for my own drop-in converter that will allow
>> the use of the higher voltage silver-oxide batteries.
>>
>> Chris
>>
>
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