> While the ideas presented here are good, I'd have absolutely NO
> confidence in any
> calculation. The only time I'd feel confident is to:
>
> 1. Purchase the exact battery that the customer will use, whatever that
> is, and install
> it into the breadboard. PURCHASE is a keyword; anything you have laying
> about is
> stale.
>
> 2. Subject the product to the temperature range expected.
>
> 3. Using a small A/D converter and timer (a PC application is fine),
> monitor the battery usage.
>
> 4. When the batteries are too low to operate the product, that is the
> end of the battery's
> life.
>
> 5. Do this at least 3 times, with 3 different batteries, to handle
> normal variation.
>
> NOW you have good data; the average of the 3 is the battery lifetime.
>
> Everything else is BULL----.
>
> --Bob

This is all lovely, but what if your expected battery lifetime is on the=20
order of months or even years? At some point you have to trust the=20
manufacturers' data.

-- Bob Ammerman
RAm Systems=20

--=20
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