The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: Keith R. Williams
Subject: Re: Difference between AC adapter and charger?
Date: Wed, 23 Oct 2002 23:46:45 -0400
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>
X-Newsreader: MicroPlanet Gravity v2.60
In article ,
> "Keith R. Williams" wrote in message
> > That part works too. The "memory effect" hasn't been seen for
> > twenty years. The "memory effect", or more properly "voltage
> > depression" issues were solved back in the early 80s.
> ** You have been contrdicted on this point countless times - are you a
> nut ??
NO, I dare say that anyone who posts as you do is, err,
> > *NEVER* drain a multi-cell NiCd pack to zero! To equalize cells
> > charge them fully, perhaps a bit of an over-charge. Cheap NiCd
> > chargers bake the living daylights out of the poor things.
> ** Some do some don't.
ALL DO! You're simply wrong (or stupid).
> > Intermediate chargers look for the negative dV/dt, which isn't
> > fool proof. Good chargers monitor the cell temperature to shift
> > from charge to float (or better - off).
> **That is far from foolproof too.
Not foolproof, no, but it's hard to bake a battery when it's not
being charged, now isn't it. The biggest failure mechanism of
NiCds is reverse charge, followed by baking the poor bastards in
a constant charge (even 1/20C will kill the things).
> > This has *nothing* to do with the so-called "memory" effect
> > though. This effect does *not* exist in modern cells to any
> > detectable extent. Most people blame the "memory effect" for
> > packs that were ruined by reverse charged cells.
> ** Add to that overcharged cells that lose their water, high self
> discharge cells that never come up to the charge in a pack and shorted cells
> due to long storagae and old age.
NiCds lose their water? Now you're stretching things a bit.
Where did you get your degree?
Perhaps you should enlist in a remedial reading program before
you try electronics again.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup