Zinc-air batteries are certainly usable as replacements for mercury (that's
what a Wein cell is at heart) and I was surprised to see that there is a
PR44 to the same physical dimensions as the SR44. But beware of shelf life!
It may well be that zinc-air batteries have 600mAh capacity, compared to
silver-oxide with 170mAh, but they don't have the 5 year shelf life of the
silver-oxide. Once the tab is removed, the reaction is underway, and you
can't easily stop it. But that might be preferable to wielding the soldering
iron, I can't see why it wouldn't work, I'm just unsure for how many days it
would do so.
Piers
-----Original Message-----
From: Chris Trask [mailto:christrask@xxxxxxxxxxxxx]
Sent: 10 July 2012 14:56
To: Olympus Discussion Group
Subject: [OM] A Question About Batteries
Yesterday I got started on converting a Gossen Luna Pro and a Lunasix
from mercury batteries to silver oxide. While browsing an electronics parts
catalogue to double-check the dimensions for a nylon spacer sleeve, I
happened to notice that zinc-air bateeries are available in the same size as
the SR44 silver oxide batteries. Since the zinc-oxide batteries are 1.4V I
was wondering if they are suitable as a drop-in replacement for the 1.35V
mercury batteries. If so, it would negate the need to take the light meters
apart to do the conversion and I would only need to make the nylon spacer
sleeve.
The zinc-oxide batteries have a capacity of 600mAh, well above the
170mAh of the silver oxide batteries.
Anyone know of this substitution having been made?
Chris
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