The re-chargeable CR-V3s are labelled "Digital Rechargeable". There is no
manufacture's name specified nor a place of manufacture.
The warning label on the outer wrapping reads, in part "........Keep the
battery in dry and cool environment. Keep battery out of children [sic]
reach."
Draw your own conclusions as to where these things originated.
jh
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Saturday, April 26, 2008 8:50 PM
Subject: [OM] Re: rechargable lithium ion batteries
> Probably all you have to do is check the specs for current draw on the
> manufacturer's web page and compare to alkaline.
>
> Chuck Norcutt
>
> John Hudson wrote:
>> I'd be quite willing to send Tim the batteries so that he could do the
>> necessary diagnostics.
>>
>> Do I have a taker?
>>
>> jh
>>
>>
>>
>> ----- Original Message -----
>> From: "Tim Hughes" <timhughes@xxxxxxxx>
>> To: <olympus@xxxxxxxxxx>
>> Sent: Saturday, April 26, 2008 7:10 PM
>> Subject: [OM] Re: rechargable lithium ion batteries
>>
>>
>>> Chuck,
>>> Actually most common Li ion batteries are not "rated" to give
>>> particularly high current,
>>> many are only rated 2C. There are some types rated for higher currents
>>> typically using a
>>> different electrode material, but they are not so common except for
>>> special uses radio control
>>> helicopter users and power drills. Most common Li-ion cells have built
>>> in
>>> internal curent
>>> limiting electronics, so you cannot draw too high a current, to prevent
>>> them self igniting! The
>>> NiMH are actually frequently rated for higher current and more
>>> importantly, don't have any built
>>> in protection electronics.
>>>
>>> In this particular case, of the so called "3V " lithium batteries
>>> these
>>> are frequently not
>>> Li-ion, but some other Li chemistry like Li-FePO4 (~3.3) with
>>> electronics
>>> or a diode to reduce the
>>> voltage a bit more. They reqiuire a special lower voltage charger too.
>>> I
>>> would not be surprised
>>> if their rated current was quite modest, like <2A.
>>> But this is a guess based on not seeing the batteries so, I can't say
>>> definitively, except the
>>> symptoms fit well with them having limited current capability.
>>>
>>> Tim Hughes
>>>
>>>
>>> --- Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>>>
>>>> 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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