[rollei_list] Re: Hearing Aid Batteries in Nikon F

  • From: Eric Goldstein <egoldste@xxxxxxxxx>
  • To: rollei_list@xxxxxxxxxxxxx
  • Date: Wed, 3 Mar 2010 18:00:05 -0500

Hi Stephen/Richard -

Here is one source (watch applications) to judge for yourself:

http://members.iinet.net.au/~fotoplot/accbatcc.htm#dc

Eric Goldstein

On Wed, Mar 3, 2010 at 5:52 PM,  <stephen@xxxxxxxxxxxxxxxxxx> wrote:
> Hi Richard:
>
> You are correct, silver does not have as flat a discharge curve as mercury.
>
> In practice, though, it hardly matters. I even use 1.5v alkalines in my
> original Photomic. Horrors!
>
> -----Original Message-----
> From: Richard Knoppow [mailto:dickburk@xxxxxxxxxxxxx]
> Sent: Wednesday, March 3, 2010 02:50 AM
> To: rollei_list@xxxxxxxxxxxxx
> Subject: [rollei_list] Re: Hearing Aid Batteries in Nikon F
>
> ----- Original Message ----- From: "Stephen Attaway" To: Sent: Tuesday,
> March 02, 2010 8:04 PM Subject: [rollei_list] Re: Hearing Aid Batteries in
> Nikon F > Hi Richard: > > If you send your Nikon F to Robert Decker
> (drwyn@xxxxxxx), > he can convert it to use 1.5v silver cells. > > I've had
> him do several of my oldies and they work fine. > --- > Rollei List Thanks
> for the tip. I am not sure whether silver oxide cells have as flat a voltage
> characteristic as zinc air cells. It is the constancy of voltage which is
> important. Very few of the devices that use mercury cells have any sort of
> voltage regulation in them; they depend on the properties of the mercury
> cell. If the voltage is not constant adjusting the meter to read right with
> a fresh cell means it will drift off as the voltage drops. My research on
> currently available cells indicates that the zinc-air cell comes closes to
> the mercury cell in the flatness of its voltage output. It is simply not as
> long lived. Mercury cells were used in some peculiar applications. A common
> one was as bias cells in electronic equipment which ran on batteries.
> Obtaining the bias from the cell allowed more of the main battery voltage to
> be applied elsewhere. These cells were often soldered in because they
> operated with essentially no load and would last for decades. -- Richard
> Knoppow Los Angeles, CA, USA dickburk@xxxxxxxxxxxxx --- Rollei List - Post
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