[sdiy] Typical load for 9V alkaline batteries?

[René Schmitz]

Glen wrote:

> 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.

It largely depends on the type of battery.
In Horowitz/Hill they state 400mAh @ 1mA and 180mAh @ 10mA for a "heavy 
duty" 9V zinc carbon battery, 500mAh @ 1mA and 470mAh @ 10mA for an 
alkaline 9V battery.

> 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.

Typically the Ah figure will depend on the load.

Cheers,
  René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159