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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.email@example.com> <3DB2A987.FA0DD93E@usa.net>
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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.
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