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'[EE] Batteries that have memory [ a poll ]'
2008\07\03@170429 by Cedric Chang

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For those of you who have restored dead NiCads or Lead Acid  
batteries, was it worth it ?

For myself, it was not worth it other than to say I could do it.  The  
restored batteries never lasted long enough to be worth the trouble.
cc

2008\07\03@171936 by Marcel Duchamp

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Cedric Chang wrote:
> For those of you who have restored dead NiCads or Lead Acid  
> batteries, was it worth it ?
>
> For myself, it was not worth it other than to say I could do it.  The  
> restored batteries never lasted long enough to be worth the trouble.
> cc
Definitely worth it on nicads.  I used to do miles of wire-wrapping with
an electric eraser tool and wire bit from Vector.  The nicads were old
and would develop shorting crystals (or whatever it is that shorts them)
and they would not charge.  Zapping them with a big cap allowed me to
continue to use them well over 5 years after they began to go bad.

Finally put the whole enchilada behind me with Alberta Printed Circuits.
 Plus I still have not figured out how to do wire wrapping with SMD
parts...

2008\07\03@204110 by Dr Skip

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Definitely worth it, although the success rate isn't 100% over a large number
of cells.

I've also found that after 'shock treatment', a few discharge/charge cycles on
an automatic smart charger like the MAHA improve the life even more. You'll see
it accept more charge each cycle, up to full value in many cases.


Cedric Chang wrote:
> For those of you who have restored dead NiCads or Lead Acid  
> batteries, was it worth it ?
>
> For myself, it was not worth it other than to say I could do it.  The  
> restored batteries never lasted long enough to be worth the trouble.
> cc

2008\07\03@230834 by William \Chops\ Westfield

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>> For those of you who have restored dead NiCads or Lead Acid
>> batteries, was it worth it ?

For me, it essentially turns out that NiCd, NiMH, and LA batteries  
are not "worth it", period.  They can't stay in a charger getting  
"topped off", they don't store charged, and storing them uncharged  
seems to quickly lead to a condition where they will no longer take a  
charge.  I'm prepared to believe that there are circumstance where  
they behave better than that (use every day, charge overnight), but  
my usage patterns don't seem to match...  I don't care whether the  
problem are "memory", or "over charging" or something else entirely.  
They just don't work for me in most applications.

Since this means that I tend to get something like 5 to 10 uses out  
of a NiCD pack before they need "attention", if a zapping gets  
another 5 or 10 charges, that's pretty good...

Li-ion are WONDERFUL in comparison.  I want Li in everything!
I'm still trying out the "low self discharge" NiMH ("eneloop" and  
similar); looks like they might be OK.

BillW

2008\07\03@234909 by Jinx

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> For me, it essentially turns out that NiCd, NiMH, and LA batteries  
> are not "worth it", period
> ............
> They just don't work for me in most applications.

Unfortunately with things like hand-held power tools, NiCd are
generally what they come with. I find it most disappointing that
otherwise not-bad engineering on even a $15 tool is made
redundant sooner rather than later by either poor-quality batteries
or charging. The variety of AA I have for a transistor radio, MP3
player, bike lights etc are rotated. None are left more than a couple
of weeks without being used, and they're lasting very well indeed.
Some are quite a few years old now and still give good power

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