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 > to rollei_list@xxxxxxxxxxxxx - Subscribe at > rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR > by logging into www.freelists.org - Unsubscribe at > rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR > by logging into www.freelists.org - Online, searchable archives are > available at //www.freelists.org/archives/rollei_list --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list