Hi Chuck,
That's a lot of numbers, and I won't check or comment on most of them. Just
to add to your data, the Oly E-1 charger is labeled 8.35 volts, 1200 mA.
The E-510 charger is labeled 8.35 volts, 400 mA. Needless to say, I use the
E-1 charger in all cases.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Thursday, July 04, 2013 7:13 PM
Subject: Re: [OM] OMD batteries update please
> According to the Wiki article on Li-ion batteries there are two common
> Li-ion chemistries with each having slightly different open circuit and
> charging voltages: "Batteries with a lithium iron phosphate cathode and
> graphite anode have a nominal open-circuit voltage of 3.2 V and a
> typical charging voltage of 3.6 V. Lithium nickel manganese cobalt (NMC)
> oxide cathodes with graphite anodes have a 3.7 V nominal voltage with a
> 4.2 V max charge."
>
> Since these voltages are per cell you'd have to double them for dual
> cell batteries as are typically used in larger cameras. That would give
> 6.4/7.2 volts and 7.4/8.4 volts.
>
> All of my older Canon and Minolta batteries are labeled 7.4 volts.
> Where 7.6 comes from I don't know. But I do note that the Oly charger
> is labeled 8.7 volts and not 8.4 volts. That would seem to go along
> with its 7.6 volt battery label. The "compatible" Progo battery says
> 7.6 volts as well but the charger is labeled 8.4 volts and not 8.7.
>
> Perhaps there is some new and improved Li-ion chemistry at work here
> (there are many such chemistries). On the other hand, maybe it's just
> hand waving and puffery. To further confuse the issue I note that all
> of the latest Canon DSLR cameras use the LP-E6 battery which is labeled
> (you guessed it)... 7.2 volts.
>
> If it works use it.
>
> Chuck Norcutt
>
>
> On 7/3/2013 4:48 PM, JOHN DUGGAN wrote:
>> Moose,
>> I just carefully looked at the small print on the back of
>> the 3 types of battery in my collection.
>> Genuine Olympus 7.6v 1220mAh chipped uses Olympus charger.
>> hahnel 7.6v 1170mAh chipped uses Olympus charger.
>> No name 7.2v 1220mAh Dedicated charger.
>> You will note that the no name battery is nominally 7.2v even though it
>> is sold as BLN1 compatible.
>> At present the Olympus and hahnel batteries seem to have the same
>> discharge charecteristics, last for about the same number of exposures,
>> and keep their charge.
>> The no name batteries however do not last for anywhere near as long and
>> if not used seem to lose a lot of their charge. Could this be down to
>> 7.2v versus 7.6v?
>> The hahnel batteries cost just under 1/2 the cost of the Olympus, with
>> the no name costing about 1/4 of the Olympus.
>> I will buy the hahnel in the future.
>>
>> Regards
>> John Duggan,
>> Wales, UK
>>
>>
>> ________________________________
>> From: Moose <olymoose@xxxxxxxxx>
>> To: Olympus Camera Discussion <olympus@xxxxxxxxxxxxxxxxx>
>> Sent: Wednesday, 3 July 2013, 21:16
>> Subject: Re: [OM] OMD batteries update please
>>
>>
>> On 7/2/2013 2:50 PM, Chuck Norcutt wrote:
>>> I think I'd stick with the Progo but only because the Progo and its
>>> charger are 100% Oly compatible. I alread knew the Progo battery talks
>>> politely about its status to the camera.
>>
>> Something popped into my mind about this. What if ... Progo has not
>> entirely correctly decoded the Oly battery-camera
>> communications?
>>
>> They claim greater capacity, yet deliver fewer shots. As I/we have
>> assumed, that could be because their capacity rating
>> is wrong - or Oly is using larger mAhs. :-)
>>
>> It could also be because the battery communication with the camera isn't
>> quite right, and the camera is shutting down
>> for insufficient battery power when there is, in fact, adequate power for
>> many more shots.
>>
>> As the camera does work with batteries that make no attempt to
>> communicate with it, it must have two means of
>> determining when a battery has run down. One would be based on
>> intelligent battery/camera communications, the other
>> presumably on simple battery voltage. Oly would have at least two
>> incentives to set that voltage high. They don't want
>> it to die 'dumbly' in the middle of shutter operation, image writing,
>> etc. and they would like to sell many of their own
>> batteries. (Why they price their own so high is a mystery to me. It they
>> were $30, I'd have two or three of them,
>> instead of the one Oly that came with the camera and three third party
>> batteries.)
>>
>> As the Progos get about the same number of shots as un-decoded batteries,
>> it's possible the camera is shutting down
>> based on voltage alone, not camera comms. My Wasabi batteries do show
>> full when recharged and lower amounts left on the
>> camera battery indicator as they are used. That must be based on voltage
>> alone, and is impossible to distinguish without
>> a lot of testing from a smarter communication.
>>
>> Is it possible that Progo has only decoded the battery/charger
>> communications?
>>
>> It's at least a theory that accounts for the apparent anomalies between
>> rated mAh capacity and no. of shots capacity.
>> Could also explain why more third party makers don't as yet sell
>> 'decoded' batteries, because they know they've not
>> cracked the comms completely.
>>
>> I'm not saying one should not (or should) buy the Progos. They do, in
>> fact charge on the Oly charger, and deliver a lot
>> more shots for the $ than the Olys. Also, I only bought one, sans
>> charger, so I know nothing about the charger.
>>
>> Theoretical Considerations Moose
>>
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