The rechargeable CR-V3 lithium-ion batteries are labelled for digital
cameras. The battery's rating is cited on the outer wrapping at 1350mAh -
3v. The same wrapping specifies the batteries as being "Li-ion".
I wonder if four re-chargeable AA NI-MH batteries, each rated at 2800mAh -
1.25v, would supply the necessary initial boost to the flash gun to get it
up and running from cold and keep it running?
What kind of home use battery tester is needed to test the mAh output /
capacity of batteries such as CR-V3 and AA sized NI-MH ones ?
John Hudson
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Wednesday, April 23, 2008 8:33 PM
Subject: [OM] Re: rechargable lithium ion batteries
> But remember that these are supposedly rechargeable lithium ion
> batteries and not elemental lithium. The thing that makes lithium ion
> batteries potentially dangerous is that they are capable of delivering
> far higher currents than alkaline or even NiMH batteries.
>
> So, I don't think your analysis can be correct if these are truly
> lithium ion batteries. But maybe the problem is that they're not
> lithium ion.
>
> Chuck Norcutt
>
>
> Tim Hughes wrote:
>> 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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>>
>>
>>
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