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[OM] Re: rechargable lithium ion batteries

Subject: [OM] Re: rechargable lithium ion batteries
From: Tim Hughes <timhughes@xxxxxxxx>
Date: Wed, 23 Apr 2008 14:37:28 -0700 (PDT)
John,
     I am Making some big assumptions here, since I don't have enough info from 
what you have
said, but I think this is what happens:

When the flash capacitor is completely discharged at a cold start then 
initially the current draw
is greatest. As the capacitor charges up a little the current is somewhat 
reduced and then
eventually drops off rapidly near full charge.

It may be the particular Li batteries you have, can't supply the very high 
initial current of a
completely discharged flash capacitor and the internal electronics then stops 
the charging, when
the battery voltage drops too much at cold start.  Once the capacitor is 
slightly charged using
the regular batteries, then the Li batteries can supply the lower current to 
continue charging it
up. The flash capacitor does not completely discharge even after a full dump, 
so once you have
charged up the capacitor a little, with the regular batteries then it will 
operate fine
thereafter, off the Li, until you switch it off and leave it to discharge 
completely.

Tim Hughes



     
--- om4t@xxxxxxxxxxx wrote:

> 
> 
> I normally use two rechargable 3 volt lithium ion battery packs in an OM 
> flash gun with my E510.
> The flash is a dedicated gun for the E series.
> 
> When the flash has not been used for several days the battery packs do not 
> bring the flash gun
> to life. If I change over to four Ultra Duracell 1.5 volt batteries the gun 
> springs to life. If
> I then change yet again to the LI battery packs the flash springs to life 
> immediately. It is
> almost as if the flash needs to be initially energized with the Duracell 
> batteries before the LI
> packs become operative.
> 
> The LI packs are only a matter of a few weeks old, are fully charged and the 
> connector points on
> both packs and in the camera are clean.
> 
> When I start off from "cold" with the LI packs installed in the flash gun, 
> the gun still remains
> inoperative even if I jiggle the packs slightly or apply a little pressure to 
> the slide mount
> cover on the flash gun casing so as to effect a "better" contact between the 
> terminals on the
> packs and in the camera.
> 
> Does anyone have any idea about what might be ailing my flash gun and / or LI 
> battery packs?
> 
> John Hudson
> 
> 
>      
> 
>  
> 
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