I don't think the Wein cell is different chemically but it does have
fewer air holes to slow down the reaction for longer life, trade off
being less current, but a camera meter is a intermittent low draw vs. a
hearing aid which is both "on" all the time and perhaps draws more "juice".
On 12/10/2016 1:15 AM, `Richard Knoppow wrote:
I don't know if Wein cells are different in chemistry from zinc-air hearing aid cells. The latter have reasonably good capacity but dry out after a while. Neither has as stable output as a mercury cell but will keep a lot of older equipment designed for mercury cells working. The Cris adapter has a diode in it which both lowers the voltage of a standard alkaline battery and stabilizes it. Expensive but works well.
On 12/9/2016 4:56 PM, Richard Lahrson wrote:
Hi, I just checked the Wein replacement cell for the mercury PX13 in my
Sinarsix (based on the Lunapro but is placed like a film holder in 4x5 cameras)
and it does not reach the battery check mark. I didn't know the Wein cells
went out so fast. I think it's only been a couple of months since the Wein
battery was activated.
Thanks Tim! I'll probably go for the CRISS adaptor for both the Mamiyaflex
and the Sinarsix.
Best, Rich
On Fri, Dec 9, 2016 at 1:31 PM, `Richard Knoppow <dickburk@xxxxxxxxxxxxx <mailto:dickburk@xxxxxxxxxxxxx>> wrote:
I was referring to the zinc-air cells used in hearing aids. They
are also very similar to mercury cells in characteristics but
comparitively short lived. Mercury cells in applications like
exposure meters lasted for years. Once the air seal is removed
from a zinc-air cell it has a life of perhaps several weeks. I
have been keeping track of the ones in my Nikon F. I also have
hearing aids that use zinc-air cells. They are much smaller than
the ones in the camera. I found that even without use they do not
last more than a couple of weeks once the seal is removed.
I suspect its possible that a mercury cell recycling program
could be made workable by charging a returnable fee as some
states do with bottles. Administrative costs might be too much
for this to be practical.
On 12/9/2016 1:12 PM, Tim Daneliuk wrote:
On 12/09/2016 03:03 PM, `Richard Knoppow wrote:
The life is fairly shortThat's surprising. My experience using them with the CRIS adapters
is that they last a very long time, much like an ordinary battery.
Then again, I turn the meter off when not in use.
The problem with replacing mercury cells is that they had very constantThat's why silver oxide is such a good choice. It mimics mercury battery
voltage until almost dead.
behavior very nicely.
-- Richard Knoppow
dickburk@xxxxxxxxxxxxx <mailto:dickburk@xxxxxxxxxxxxx>
WB6KBL
--
Richard Knoppow
dickburk@xxxxxxxxxxxxx
WB6KBL
