🚀 go-pugleaf

In article <JON_SREE.92Apr6094821@world.std.com>, jon_sree@world.std.com (Jon Sreekanth) writes:
> 
> I'm using a 9V alkaline (Duracell, or some similar store brand) battery
> in a circuit which has a fairly low current drain. I estimate 100uA 
> constant drain, and about 0.5 mA for maybe 6 hours per day. Also,
> the circuit will be functional down to about 4V from the battery. 
> 
> Is there some magic formula for estimating, from your experience, or 
> any  published specs (where do I find them ?) battery life ? Battery 
> life is defined in this case as # of days between buying an average-aged
> battery from a drugstore to voltage dropping below 4V ? 
> 
> (Right now, I have a 500maH estimate from Panasonic, and I've looked at
> Horowitz and Hill. I'm hoping I can get more maH because of the low
> drain, and because the circuit can go down to about 4V at least.)
> 
> Thanks for any pointers, 
> 
> / Jon Sreekanth
> 
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> 

Kodac used to sell a 9V lithium battery that would probably last longer than
the alkaline.  It costs around $5 though.