How many cell per pack ?

I assume the standard 4-cell pack.

In that case, in most likelyhood you'll just reach
an equilibrium point where the charge current
equals the self-discharge current and the
voltage will almost (but not quite) approach 5V.
It's like an open circuit with pack voltage at
(close to) 5V.

I doubt that it will be destroyed as well,
since full charge is at 1.8V/cell, which
for a std 4-cell pack comes to around 7.2V.
This can never be arrived at, given your 5V source.

I really don't see what you can gain from this
experiment if you don't use constant current
AND a higher voltage source.

Lawrence Lile has some good suggestions in
his summary.

Regards,
Peter Tiang

----- Original Message -----
From: "Olin Lathrop" <olin_piclist@EMBEDINC.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, May 15, 2001 8:17 PM
Subject: [EE]: NiMH batteries


> I ran another test with a different virgin battery pack.  This time the
> current was higher than before.  It started out around 130mA and ended up
> around 40mA, which is .26C to .08C if these packs are made of 500mAH
cells.
>
> This test ran for over 13 hours.  A plot of the measurements is attached.
I
> was hoping to see something different happen when the pack got fully
> charged, but the voltage just kept going up.  I guess I wasn't patient
> enough.  I'm about to start another test, and this time I'll let it run
much
> longer.  I don't care if the pack gets destroyed in the process, I want to
> see what these things do as they get fully charged and beyond.
>
> I'll keep you posted.
>

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