Re: TI-H: 92 battery pack expander


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Re: TI-H: 92 battery pack expander




>>i dont think the 4 [AA batteries] produce 80 amps
>
>Sure they will, just not for very long. (Acutally, there is
>a limit to the amperage batteries will supply, determined by
>the chemistry of the battery (temp, age, charge, internal resistance,
>etc.), but 80 amps should be within that.

It's VERY unlikely that it would supply 80 amps, even for less than 1
second.  Their short circuit current is probably on the order of 6 or
7 amps for < 0.5 seconds.  Simple battery characterization tests will
show this.  The only commercial batteries that'll give 80 amps for any
period of time is either automotive (obviously) or those bigass
lantern batteries.

>What you want is a battery pack with higher Ah (amp hour) rating.
>Some battery manufactures give Ah ratings and discharge curves on
>their websites (looks like duracell doesn't, but energizer does).
>If you measure the current draw of the calculator, you can give
>an estimate of how long it will run on a particular kind of
>battery.

Duracell has datasheets on most of their popular batteries, it's just
tough to find them on their website.  Seek and ye shall find :).

-Mel


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