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'[EE]: Help with battery choice'
2003\04\17@164423 by Alex Kilpatrick

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I need a battery that can provide 3 mA at a minimum of 6V for at least
50 hours.  Coin cells are rated much higher than this, but they are for
a typical current of .2 mA.  The datasheets don't even go above 2 mA for
coin batteries, so I am assuming they wouldn't work too well.  A 9V
battery is more than enough, but I would like to get something smaller
if possible.  And I don't want anything more expensive than a 9V
battery.  It is a custom job, so if it is some exotic hard-to-find
battery, that is fine.
Any ideas?
Thanks!
Alex
 
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2003\04\17@170150 by Brian Aase

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> I need a battery that can provide 3 mA at a minimum of 6V for at least
> 50 hours.

Energizer A544 perhaps?

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2003\04\17@170409 by Herbert Graf

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> I need a battery that can provide 3 mA at a minimum of 6V for at least
> 50 hours.  Coin cells are rated much higher than this, but they are for
> a typical current of .2 mA.  The datasheets don't even go above 2 mA for
> coin batteries, so I am assuming they wouldn't work too well.  A 9V
> battery is more than enough, but I would like to get something smaller
> if possible.  And I don't want anything more expensive than a 9V
> battery.  It is a custom job, so if it is some exotic hard-to-find
> battery, that is fine.
>
> Any ideas?

       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

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2003\04\17@172815 by Alex Kilpatrick

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>
> > I need a battery that can provide 3 mA at a minimum of 6V
> for at least
> > 50 hours.
>
> Energizer A544 perhaps?
>
That's rated at 30K.  150 mA-H with a typical drain of .16 mA.

:-(

Alex

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