Graham,

 Yes.  Go to Radio Shack and get a copy of their battery book.   It has
 curves and charts in it that will allow you to get a good idea of what
 to expect in battery lifetime(s).  They are geared to RS batteries in
 particular, but I've found I get similar results using the charts with
 other mfg's products also.  Actually, I usually get somewhat better
 results with other mfg's.

                                                Regards,

                                                  Jim




> Hi,
>
> Does anyone have a general rule of thumb (formula) to determine how
> long an
> Alkaline AA battery will last at a certain constant current drain?
>
> I am actually using 6 Duracell Procell's in series, am I correct in
> thinking that
> the capacity will be the same, just with a higher voltage?
>
> The design I have uses 400uA when turned off, and I am worried this
> will drain
> the batteries unacceptably if left for a long time.
>
> Thanks
>
> Graham North
>
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