Re: Battery matching solution?

The internal resistance of the battery changes as the battery is discharged.
Also things like temperature, age and other factors effect it.
I think the proper way to test your battery is to fully charge it to the
manufacturer specification and discharge it at a given amp hour rate.
Compare your discharge curve with the manufacturer. Choose the same
discharge rate that the manufacturer does btw. If your curve is a little
less than what the manufacturer says then your probably ok. If it is much
less then you need a new battery.

Josh


"Kavall" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Battery matching.
>
> Here is how I would go about it. Charge the cells individually untill
> their voltage starts to drop, aka. peak charge them. Measure the peak
> voltage. Then hook them to a fixed load and measure their discharge
> time to 0.9V. Let the cell rest. The next day repeat. Take the
> measurements and compare close discharge times and close peak
> voltages. If you could measure internal resistance it would be nice,
> but I don't know of a simple way. In my opinion the important
> qualities are.
> 1. Close discharge times
> 2. Close and low internal resistances
> 3. Close peak voltages