[sdiy] Typical load for 9V alkaline batteries?

[Glen]

At 07:08 PM 6/4/03 , Speth, John wrote:
>They key battery parameter is capacity.  Looking at the datasheet for the 
>Energizer 9V, the capacity is 625 mA-hours at 25 mA continuous drain.  
>Lacking any specific drain or duty information, that translates to 25 hours 
>of continuous use at 25 mA.  As you know, YMMV due to the various conditions 
>you listed.

That's certainly encouraging. I didn't think a 9V would handle a 25 mA load
so well. I should be fine, if that's the case.

However, is it really so simple as dividing the AH rating by your circuit's
drain in Amps, to arrive at the approximate run-time? I was under the
impression that it was more complicated than that, especially if your
circuit consumed considerably more or less current than what was specified
in the AH test condition.

At any rate, you've already answered the most important question for me.


thanks,
Glen Berry