Re: Not old NiCD battery shows zero volts. Possibly revivable?

On Tue, 30 Oct 2007 16:01:53 GMT, zekor@xxxxxxxxxxx (G) wrote:

:In article <0l9ei31knv7tmt09lk68b6k4a2p9k2g6pg@xxxxxxx>, Dan_Musicant <man@xxxxxxxxxxx> wrote:
:>On Mon, 29 Oct 2007 15:15:09 -0500, "Thomas T. Veldhouse"
:><veldy71@xxxxxxxxx> wrote:
:>
:>:
:>:In that case, polarity reversal is quite likely the cause if you allowed the
:>:batteries to drop in charge enough for a cell to go completely dead. It
:>:really wouldn't be honest to ask the vendor/retailer/manufactor to replace the
:>:batteries, since it is almost certainly caused by you [no offense].
:>
:>"caused by you [no offense]."
:>
:>Actually, the thing is, it didn't seem to me to be the case that I ran
:>it down in such a way that the cell would get a reverse polarity. I have
:>been in the habit of using the light for 6 weeks or so, then running the
:>light down until it _starts_ to dim (with my supervision), and then
:>charging it. I got information somewhere saying I should
:>run-down/recharge the batteries every 6 weeks or so for maximum life.
:>
:>However, what I suddenly experienced inexplicably was a dimming of the
:>light before the 6 weeks was up (or certainly before I'd expect it to
:>dim). Then after a normal recharge it dimmed again way sooner than I'd
:>expect. Then charging for 6 hours (as stated), the one battery showed
:>zero volts. Thus, I was doubtful that I'd induced a reverse polarity on
:>the cell and thought that perhaps the cell had died "on its own" and
:>that it wasn't my fault. That's why I thought I could perhaps prevail on
:>the company to replace it. Does this make sense?
:>
:>Perhaps I should assume that somehow the ?? cell got a reverse polarity,
:>however I don't understand how this was my fault (as stated above).
:>Also, I'm wondering if the cell might not have gone bad from something
:>else. Possible?
:>
:>Dan
:
:I said it can go bad from overcharging.
:
:And then just sitting around or with some usuage.
:When it gets the tendancy to go into short mode, it will drain itself very fast. Self induced.
:I have some over 40 year old cells that are still usable.
:
:greg

This is a very slow charger and people tell me that with a C10 or slower
charger (I think this is C20 or slower, actually), a NiCd won't
overcharge... i.e. it will tolerate leaving it on the charger even when
it's fully charged. These cells have never been on a fast charger. The
one I'm using is rated:

6 volts DC
125 ma

I'm using it to charge them in series, so 6 volts seems right.

Looking online I see no source for NiCd C tabbed cells any more. The
company I bought these from 10 months ago was acquired by
batteryjunction.com (bought from Amondotech.com), and they aren't
selling these 2800 mah C's anymore. They do have 2100 mah Sub C cells,
which I believe are smaller than C's. I guess I could buy Sub C's and
wire them up in the light and tape the cells in to keep them from
jostling around.

Dan

Email: dmusicant at pacbell dot net
.

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