Edson Brusque (Listas) wrote:
>
> Hello,
>
>     I'm making some measurements and I've found some interesting numbers.
>
>     When sleeping, the PIC16F628@4MHz consumes about 42uA @ 5V. If I suply
> it with some AA Alkaline batteries, it would mean rougly:
>     2850mAh / 42uA = 67857 hours = 2827 days = 7.74 years without use.


Not true! :o) The capacity as shown is generally
for 10 or 20 hour discharge times. These are high
enough currents that internal leakage current does
not affect the capacity. Once you factor very slow
discharge currents the internal leakage may be much
more than your 42uA PIC. Probably about double,
which would explain shelf lifes of 3 years etc. ;o)
-Roman

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