NiMH has only a small -deltaV (<20mV),
using dT/dt, a sharp rise in battery pack
temperature, is a much more accurate detection
of full charge. This method used in most
"smart" notebook batteries.

But this might not prove practical if
the NiMH pack does not have built-in thermistor.
Don't bother measuring temperature outside the pack.

I read somewhere (a couple of years ago, so don't ask
for detail) that manufacturer intentionally design
in -deltaV into NiMH packs so that they
can be charged on the plenty NiCD chargers out
there and that -deltaV is not true characteristic
of NiMH.

So you are right and wrong.

Cheers,
Peter Tiang

----- Original Message -----
From: "Olin Lathrop" <olin_piclist@EMBEDINC.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, May 09, 2001 12:18 AM
Subject: [EE]: NiMH batteries


> > One further wrinkle, it's NICAD that has the negative droop.
> > NIMH just flattens out.
>
> Not according to Panasonic, who is one manufacturer of these batteries.
>
>
> ********************************************************************
> Olin Lathrop, embedded systems consultant in Littleton Massachusetts
> (978) 742-9014, olin@embedinc.com, http://www.embedinc.com
>
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>

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