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Subject: RE: Best Batteries
From: Chris Holt (amiga2k_at_cox.net)
Date: 2003-10-30


On Thu, 30 Oct 2003 11:27:07 -0500, Fred Maxwell wrote:
> Chris Holt wrote:
>
>
>> As long as they can handle the current demands of the Archos, they
>> should be a good deal. I do recall reading about some issues with
>> the 2000 Mah cells suffering reduced capacity after being used in
>> high drain devices.
>>
>
> The Archos devices are NOT high drain. My electric RC airplanes are
> high-drain. My SLR camera flash is high drain. Typical NiMH batteries
> are rated for a discharge rate of up to 2C to 4C (2-4 times the current
> rating). Thus, for a 2100mah battery, that would be a discharge rate of
> 4200mah-8400mah. Eveready's tech graphs on their AA NiMH cells bear
> this out though their application manual specifies a maximum discharge
> rate for their NiMH batteries as 4C. RC Modelers often push the
> batteries to much higher discharge rates than even 4C, with some going
> as high as 10C. Basically, if the battery takes longer than 1 hour to
> discharge, it's not a high-drain device.
>
> There are some issues with the 2300mah cells being fast-charged. They
> prefer a slow charge of about 1/10C to attain maximum capacity, but I
> don't think that the charge rates provided by the AJB would present any
> problem.
>
> Regards,
> Fred Maxwell

Sorry, I was referring to problems caused by cells that are unable to
provide the temporarily high current required for disk spin up. Not to
imply that the Archos is a high drain device.

Chris



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