Normally, I'm just a lurker on this list, but I have to
correct one posting concerning reviving NiCad
batteries. It's not a good idea to run NiCad's all the
way down if they are connected in series. What ends up
happening is that at some point one cell in the string
runs out of juice and cannot supply current - from that
point on it is subject to reverse voltage, which is very
damaging to the cell. You can ruin even a good string
of NiCads this way.
There is a technique for improving the performance of
NiCads by connecting them to a very low impedance load.
The theory here is that over time the Cadmium builds up
into large crystals at the anode, and subjecting the
battery to large current tends to break up these
crystals and restore them to the small state, which is
lower impedance. However, you don't want to fully
discharge the battery in this manner, and you have to be
careful not to blow up the battery (the high current
heats up the battery, too).
For more information on rechargeable batteries, you can
go to this link:
http://www.buchmann.ca/
Cheers,
Kurt
I'm just a guy who occasionally stops to help people on
the information highway.
P.S. I have a G3 Powerbook 1400 (best laptop keyboard
ever made), and a Powerbook 520 that I loan to my less
mobile friends.
Quoted article below===================================
Date: Thu, 12 Jul 2001 21:55:49 -0700
From: Clark Martin <[EMAIL PROTECTED]>
Subject: Re: Any hope for PB 1xx batteries?
Message-id: <a0501040ab7742cd96ef0@[207.104.246.55]>
At 10:45 PM -0500 7/12/01, Flint Million (PB List) wrote:
>I have a stack of dead PB 1xx batteries - NiCd type.
They show the typical
>signs of use (they only run the system for about 10
minutes.) Is there
>anything that can be done that might get these
batteries to at least hold
>some charge (say 45 mins or so) or are they just scrap?
About the only thing you can try is to deep
dischargethem. Do this
by connecting a load to the battery terminals. The load
should be 10
ohms or more. Leave it with the load connected
overnight and then
recharge it. If it still doesn't hold a charge it's
pretty much
dead. At this point the only thing you can do is to
open the
battery up, remove the dead cells and swap in good cells
from other
batteries.
--
Clark Martin
Macintosh Consultant
Another designated driver on the Information Super
Highway
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