As said, zinc-air batteries consume themselves fairly rapidly with, I
would assume, a declining output voltage.
A couple of years ago, I converted my Luna Pro to silver bttys (SR44 x2)
by purchasing a proper conversion kit from
Bogen Photo Corp. I think that they currently have marketing (or
support) rights to Luna Pro.
It is a simple "drop-in" kit that uses 2 SR44 silver cells. The kit
number from them is 4145 and, at the time, was
about $25.
Rand E
------------------------------------------------------------------------
Piers Hemy wrote:
> 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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