David Bell wrote:
> http://www.renata.com/pdf/watch/DB303.pdf
>
> Found This
>
> Dave
>
> Behalf Of ScottGee1
> Subject: [OM] Re: Vanishing batteries?
>
>
> Thanks for all the replies and reassurance.
>
> BTW, are these "good"?
>
> http://tinyurl.com/uavdw
>
> I mean, they're "Swiss Made".
When silver oxide button cells were young, they could be made either
with low current capacity and very low likelihood of leakage or with
high current capacity and greater incidence of leakage. As watchmakers
were the major early users, leakage was a big no-no. So many were made
in two versions, low and high drain, with identical dimensions and
different construction. Watch makers could then specify a battery number
that would assure low leakage. The original problem is past, but the
naming confusion lives on. You can pretty much use high drain models to
replace low drain models
One of these pairs is the 303 and 357 and there are several others.
Energizer recently combined them into one model, 303/357. Unfortunately,
the discharge curve is more like the 303 than the 357, although they are
still rated for high drain. It simply means that they will reach the
voltage level that causes electronic shutter OMs to lock up earlier than
the old 357. Not a BIG thing, but annoying.
The Renata 303 discharge curve is wonderful, but only speced at .189 ma,
with no mention of intermittent high current use. So it may or may not
be a good battery for OMs. Looking at the spec. sheets for Energizer,
you will see that the 303/357 is rated at a higher current, .238 ma and
specified for "USE ON CONTINUOUS LOW DRAIN (HIGH PULSE ON DEMAND)", such
as running a meter most of the time, then running a shutter
intermittently <http://data.energizer.com/PDFs/357-303.pdf>.
Whether the Renata 303 would preform well compared to a true 357 or
SR-44W in camera use could only be determined by testing.
However, I do see that Energizer has introduced a new 303/357H, with a
significantly longer flat discharge curve
<http://data.energizer.com/PDFs/357-303H.pdf>. I think that would
perform better than the Renata, or any, 303 for OM use.
Moose
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