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Re: [OM] 357 batteries

Subject: Re: [OM] 357 batteries
From: Tim Hughes <timhughes@xxxxxxxx>
Date: Sat, 10 Oct 2009 19:14:59 -0700 (PDT)
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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