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'[EE]: Help with battery choice'
2003\04\17@181754 by William Chops Westfield

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   Lithium cells? Two in series will get you 6V, and they have huge power
   compared to their size. Cost might be a factor, not sure how cheap you
   can get them. TTYL

heh.  In case no one noticed, there has been a recent "price war" in the
popular CR123A (1300mAH) sized lithium battery, because (?) of their common
use in certain "upscale" flashlights.  From sites like http://www.surefire.com,
you can get them for $15 for a 12-pack (that compares to about $8 EACH for
duracells at the local camera store...)

I saw at least one spec on the net for CR2032 sized lithium coin cells that
claimed they were good for a maximum drain of up to 4mA, but I can't find
"supporting" documentation from any of the big-name manufacturers.

BillW

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2003\04\18@004634 by Alex Kilpatrick

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>
> heh.  In case no one noticed, there has been a recent "price
> war" in the popular CR123A (1300mAH) sized lithium battery,
> because (?) of their common use in certain "upscale"
> flashlights.  From sites like http://www.surefire.com, you can get
> them for $15 for a 12-pack (that compares to about $8 EACH
> for duracells at the local camera store...)
>
> I saw at least one spec on the net for CR2032 sized lithium
> coin cells that claimed they were good for a maximum drain of
> up to 4mA, but I can't find "supporting" documentation from
> any of the big-name manufacturers.
>
> BillW
>
Awesome!  Thank you!  Thank you!  
Here is says that the nominal current it 20 mA continuous:

http://rocky.digikey.com/WebLib/Panasonic/Web%20data/CR2,%20CR123A.pdf

What kind of battery holder would you use for these?  It seems like an
odd size.

Alex

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2003\04\18@022430 by William Chops Westfield

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   http://rocky.digikey.com/WebLib/Panasonic/Web%20data/CR2,%20CR123A.pdf

   What kind of battery holder would you use for these?  It seems like an
   odd size.

Actually, it's a pretty standard size for memory backup power and such.
I've retrieved such batteries from token ring hubs and such, where they
appear to last ... longer than token ring did.  (I think they only got use
to occasionally switch the state of some latching relays, so this isn't
really surprising.)  "Memory Protection Devices" once sent me some nice
samples, so I'll recomend them here: http://www.batteryholders.com (some
"web designer" got loose at their site, though.  I had problems from my mac
with both netscape and explorer.)

There may be two varieties of these cells, one designed for memory
backups and such, and the other for more consumer oriented high-drain
applications.  The duracell website has a data sheet with continuous
discharge curves at currents up to 1A.  (as well as the info I recently
alluded to about how many 1.8A, 3 second pulses you can get if they're 7
seconds apart, and such.)

BillW

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2003\04\18@153338 by Alex Kilpatrick

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Thanks.  Unfortunately, now that I look closer at the size, two of those
is about the same size as a 9 V.  :-(

Good capacity, though.

Alex

> {Original Message removed}

2003\04\18@163541 by William Chops Westfield
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Personally, I would try the 2* cr2032 lithium coin cells and see how it
works.  It's not like you'd be the only one "violating" specs on these,
and it's not even clear that you're doing that.  You're just operating
outside the region that is well-documented.  If you need 50 hours and
tests show you getting 52 hours, I'd worry.  But if you end up getting
60 hours or more I'd think you'd be pretty safe.

The cr2032 battery is another size that varies quite wildly in price.
"cheap imports" regularly sell for about $0.30 on ebay, rather than the
$2 each you pay at radio shack.

BillW

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2003\04\23@063228 by Alan B. Pearce

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>Awesome!  Thank you!  Thank you!
>
>Here is says that the nominal current it 20 mA continuous:
>
>http://rocky.digikey.com/WebLib/Panasonic/Web%20data/CR2,%20CR123A.pdf
>
>What kind of battery holder would you use for these?  It seems like an
>odd size.

A disposable camera perhaps? Try your local 1 hour processing shop for any
number of free samples which they will be only too happy to give you after
they take the original customers film out. May even be a source of zero cost
batteries - especially if there is a flash unit in the camera.

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