Checking the data sheets again rather than my memory, the Energizer says -2% pa
and the renata -10% pa.
Energizer when I spoke to them, said in accelerated testing it projected out at
less than 2% but that they did not want to put that on data sheet.
Renata said they sell mostly to watch market, where they get used rapidly so
not a big issue for them.
Shelf Degradation is due to secondary reactions at electrode (purity of
materials) and also due to very slow loss of electrolyte/sealing. Energizer
claimed they have greatly improved sealing over their older cells and that is
why they have got such good shelf life.
In general the high discharge rate KOH cells, like original 357 are more
difficult to seal than low rate (NaOH) cells.
tim H.
--- 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, 5:33 PM
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
--- On Sun, 10/4/09, Moose <olymoose@xxxxxxxxx> wrote:
From: Moose <olymoose@xxxxxxxxx>
Subject: Re: [OM] 357 batteries
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Date: Sunday, October 4, 2009, 6:19 PM
Fernando Gonzalez Gentile wrote:
> ... After a little of hair-pulling, am I correct in assuming that (at least
> on paper), Renata 357 are somehow outstanding?
>
> <http://www.renata.com/pdf/watch/DB357.pdf>
>
Yup, terrific.
Moose
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