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From: Roger Johansson
Subject: Re: Reducing contact resistance for low volt use?
Date: Fri, 13 Dec 2002 07:29:37 +0100
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I have been looking at the discharge curves for battery packs thinking
about what a translation routine would look like.
The most important value, the total capacity of the battery, is
computed by multiplying Amps with time in the constant current test.
In the constant load test it is a little more complicated but no
We take the value of voltage and resistance for each ten second
measurement and compute each such period separately and then add all
these periods. The total capacity and the time when the voltage has
fallen to a certain value can be found with this method. A special
routine is used for the first 10 seconds where the curve has another
shape, but a very easy shape to compute as it is a straight line.
The shape of the curve is computed with one routine for the first 10
seconds and another routine for the rest of the curve.
Use the values for 10 sec point and the end point where the voltage
has fallen to .9Volt, to choose a typical constant current curve which
Check manually (visually) that the discharge curve from the constant
load test has the typical shape to know that the translation can be
There are some more details to work out but it is no problem to write
such a translation routine.
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