Since battery discharge is at a linear rate, you can usually begin the
discharge with a resistor and closely monitor the voltage for say one half
hour. You can make a graph from the first half hour, monitored every 10
minutes or so, and extend the line created on a graph. It is a lot quicker
than waiting for the entire discharge.

Since capacity is the ability to resist change of voltage, you can also
determine the capacity by monitoring how quickly the voltage changes on
charge. Older batteries without the ability to hold a charge will also
charge much quicker (compared to other batteries that are full capacity).
This would be a useful test for a constant current charger rather than a
constant voltage type.

Colin Lamb N12HS



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