> I've built up a 12V stack of them that is theoretically 10 Amp-Hours.
>
> I find the voltage floating all over the place while these batteries are
> charging, and I can't imagine finding the negative voltage slope after
> watching the voltmeter wander up and down so much while charging with
about
> 2 amps.

I think you are charging them with much to high current.  The fast charging
current for NiMH batteries is usually about 1C, which is probably 1/2 amp
for these batteries.  I also wouldn't charge them as a 12V stack.  Too many
cells end up in series and variations between cells can cause problems since
they are all getting the same current.

By the way, I changed the topic to EE.  AD is not appropriate anymore.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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