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From: "Phil Allison"
References: <0001HW.B9D43FDF0325BBB11662EAD0@news.covad.net> <0001HW.B9D4EE870344BA681662EAD0@news.covad.net> <3DB01FBB.EAF744F9@usa.net> <0001HW.B9D572FB034E39101662EAD0@news.covad.net> <3DB02E27.firstname.lastname@example.org> <3DB2A987.FA0DD93E@usa.net> <7vSs9.669$ZO3.52300@newsfep2-gui>
Subject: Re: Difference between AC adapter and charger?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Thu, 24 Oct 2002 11:14:46 +1000
NNTP-Posting-Date: Thu, 24 Oct 2002 11:06:02 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Keith R. Williams" wrote in message
> > > "Phil Allison" wrote ...
> > >
> > > > Once a pack becomes unevenly charged it is next to
> > > to> even it out without access to each cell.
> > > >
> > > > The only way to get good results from a Ni-Cd pack is to
> > cycle it fully each time it is used and leave it in a flat condition
> > is needed again - then charge it. As this does not suit the vast
> > of > non-professional Ni-Cd users we have all the problems.
> > >
> > > Everything you have said in the thread makes good sense to me Phil;
> > > ask you to clarify one point ...
> > >
> > > Is there any problem with leaving NiCd batteries in a flat condition
> > > prolonged period of time ? What's 'prolonged' ?
> > ** They should rest with 1.2 volts on each cell - not zero That's
** No it is not. It is the residual open cct voltage on a fully
discharged Ni-Cd cell. The way you tell is to apply a load and watch the
voltage drop, remove the load and it will recover.
They should never be run down below
> .9v/cell, but 1.2V?
** I think you took me out of context.
> > They can survive a long time like that. But if you did not want
> > to use them regularly then why the heck do you buy them ?
> They can survive at 0V, just don't run them down there in a
> multiple cell pack.
** Bad move - 0 volts can lead to dentrites - ie shorted cells.
For long term storage, let them self > discharge and let them be. NiCds and
NiMH technology is quite the > opposite of lead-acid!
** Better to deliberatley discharge, self discharge is very
unpredictable and cell to cell variable.
Agreed! Absolutely. We have an issue with the inbetweens.
> BTW, your posting technique is so non-standard it's very hard to
> follow! Thre are standards in this medium. ...and they work.
** Really, what is the problem? Maybe it is your newsreader.
. . .. .................... Phil
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