OB-1 back up battery

[Arthur Harrison]

I was looking for the ol' EP675 hearing aid Hg cells a while ago for
my ol' h-p calculator.  No luck!  In fact, Ralston (Yup, that's the dog
food company that apparently now owns Eveready) won't even admit
to ever having sold mercury cells!

How about a retrofit of silver oxide cells?  I believe they have a nice flat
discharge voltage and a very long shelf life.

There is a  battery reference on the web at:
http://ecity.batteries.net/32-33htm.htm.

-Art

-----Original Message-----
From: Bill Layer <b.layer at vikingelectronics.com>
To: FENATIC at aol.com <FENATIC at aol.com>; synth-diy at mailhost.bpa.nl
<synth-diy at mailhost.bpa.nl>
Date: Friday, November 13, 1998 8:48 AM
Subject: Re: OB-1 back up battery


>Hey,
>
>>Gettin set to do some fiddling with my bbq'd OB-1, and I pulled the
corroded
>>back up battery out of its holder. Its an old mercury 4.2V T-136 (i
think).
>>First electronics shop i hit couldnt come up with an exact replacement,
and
>>suggested a 4.5v that was a different size.  They told me to check another
>>outfit to try and find one more physically similar.  Is the voltage
>difference
>>a problem?  Is there any permanent damage likely from this batterys
>demise? It
>>appears the corrosion only ate up the battery holder connection on one
>end. Is
>>there a source for the correct battery?  Thanks.
>
>Mercury batteries have become a real environmental problem, and they are
>very difficult to get. However, local laws do prevail, and you can probably
>mail-order the exact unit from one of our 'less progressive' states...
>
>What you're likely to find is a 'PC' version of of your battery. It is
>alkaline, rather than mercury, and has a slightly higher resting voltage.
>The service characteristics of the alkaline are inferior to the mercury. An
>example of this is the PX32 merc. used in the Leica camera. If you live in
>Minnesota, you (I) have to buy the PC32A.>
>
>
>Bill Layer, member
>
>The International Brotherhood of Jazz Dancers, Pastry Chefs and Nuclear
>Technicians