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'Lithium Coin Cell Discharge Current?'
1998\06\16@155012 by Lewis H. Cobb

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How much can one realistically draw from a 3V lithium coin cell in a
hand-held device application for short periods of time - say 30 seconds
etc.  I am drawing about 12mA but the specs (what ones i can find on the
web ) are all going on about uA draws as they are talking about memory
backup applications.

Thanks for any help people can provide.

Lewis

1998\06\16@171009 by David VanHorn

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>How much can one realistically draw from a 3V lithium coin cell in a
>hand-held device application for short periods of time - say 30 seconds
>etc.  I am drawing about 12mA but the specs (what ones i can find on the
>web ) are all going on about uA draws as they are talking about memory
>backup applications.


This seems reasonable, but if it's not on the datasheet, yer' on yer' own!
The next batch you get may not deliver at that rate.

12mA for 30S is  360ma/S   A small supercap might help a lot.
Digikey has Panasonic SG caps. A 0.22F unit would take a lot of
the surge current off the battery.

1998\06\17@062941 by synapse

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Lewis wrote:

> How much can one realistically draw from a 3V lithium coin cell in a
> hand-held device application for short periods of time - say 30 seconds
> etc.  I am drawing about 12mA but the specs (what ones i can find on the
> web ) are all going on about uA draws as they are talking about memory
> backup applications.

Well, if I remember correctly from my days at Timex we could reliably draw up to
20mA peak (say a few ms) and about 10mA sustained. BUT - it was only true for
the large Lithium cells (2025, 2032), we only did it for the manufacturers we
had qualified (Panasonic and Eveready I think) and "sustained" was only for a
few seconds. The highest currents we drew for as long as 30s (or longer) were on
the order of 4-5mA; I don't know with higher currents. And by the way, most of
these figures were directly from the manufacturer and were not in the
datasheets. As a side note, please take precautions against shorting of large
Lithium cells. Discharge pulses on the order of several amps ARE possible.

Michael

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