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Subject: Re: Best Batteries
From: BlueChip (cs_bluechip_at_webtribe.net)
Date: 2003-10-30


I'd like to thank everybody for their input on batteries for my RockBox
machine.
I now feel that I can speak about them with a degree of knowledge.
I think in summary: cheap, but not so cheap they leak; and highest mAh
around at the time, certainly not less than 2100; when they break put them
in a landfill and buy some more :)

Also, sorry if this subject was OT. I look forward to reading lots of
technical questions and help in future (although I also got seriously
slammed last time I did that too - LOL)

On the subject of which....
Zagor, has LinusN contacted you yet?
If not please give either me or him a shout.

BC

>The best batteries are found on NEWEGG and are $16 to the door.
>IPOWER US NI-MH 2100mAH Battery, found at:
>http://www.newegg.com
>search for "2100 mah batteries"
>should be $12 + $4 shipping.
>
>I purchased these batteries at the beginning of November 2002 and began
>having problems with them at the beginning of October 2003. I never really
>saw how long they lasted without charge, but they worked for me. I used
>them probably 4 to 6 hours a day, and then charged overnight, just about
>every day.
>
>Brian
>
>
>----- Original Message -----
>From: "Chris Holt" <amiga2k_at_cox.net>
>To: <rockbox_at_cool.haxx.se>
>Sent: Thursday, October 30, 2003 11:55 AM
>Subject: RE: Best Batteries
>
>
> > 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
> >
> >



Page was last modified "Jan 10 2012" The Rockbox Crew
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