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Re: [OM] 357 batteries

Subject: Re: [OM] 357 batteries
From: John Hermanson <omtech1@xxxxxxxxxxx>
Date: Mon, 12 Oct 2009 10:22:29 -0400
A very helpful update, thank you!
___________________________________
John Hermanson  |   CPS, Inc.
21 South Ln., Huntington NY 11743
631-424-2121  |  www.zuiko.com
Olympus OM Service since 1977
Gallery: www.zuiko.com/album/index.html


Tim Hughes wrote:
> 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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