Thanks much, Tim. I didn't see the high drain Sony SR44 aging data.
If they stay near forever in the fridge like the energizer 357,
then the $2.50 price may be well worth it.
Mike
Here are many of the 357 data sheets compared side bty side, including
Renata,
although it does not include the Renata impedance data and more
detailed aging
info:
http://olympus.dementia.org/Hardware/PDFs/357BatteryData.pdf
Tim Hughes
--- On Sat, 10/10/09, Tim Hughes <timhughes@xxxxxxxx> wrote:
From: Tim Hughes <timhughes@xxxxxxxx>
Subject: Re: [OM] 357 batteries
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Date: Saturday, October 10, 2009, 5:23 PM
Renata sells mainly to the watch market.
So the cell discharge curve shown in literature, is at a low current
making it
look a bit better. Remember the OM's draw currents of ~16mA for short
durations
and the original 357's discharge curve was rated for significant pulse
current. Although not rated, the Renatas do have low enough impedance
when
new, however the shelf life is not nearly so good.
The shelf life is much worse than Energizer.
Renata loses capacity at about 4~5% pa , versus ~ 1% for the Energizer.
I evaluated the Renatas when I was evaluating the original Energizers,
and they
also have a fairly large increase in impedance after about 2 years of
storage,
although that drops again as time goes on.
So if you do get Renatas, make sure you store then in refrigerator (not
deep
freeze) so they stay more like new when you need them. Stored at <5C of
typical
refrigerator, the shelf life should be comprable to energizer stored
unrefrigerated. Also get them from a supplier with a large turnover,
so they
are sure to be fresh.
Tim Hughes
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|