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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