On Jun 18, 9:33*am, "hr(bob) "
wrote:
On Jun 18, 5:22*am, "
wrote:





On Jun 17, 9:27*pm, wrote:

On Fri, 17 Jun 2011 17:09:12 -0700, "Bob F"
wrote:

wrote:
On Jun 17, 11:35 am, "hr(bob) "
wrote:
On Jun 17, 9:58 am, "
wrote:

On Jun 17, 10:04 am, RicodJour wrote:

I'm interested in experimenting with trying to revive some old NiCd
batteries by zapping them and I ran across this on YouTube. Good,
clear video about using two other good NiCd batteries to revive the
dead one.

http://www.youtube.com/watch?v=1e8hHLyXAyQ

R

I wonder if it works how much more life you get out of them.
I saw this a while back when I had a driver/drill pack that went
bad. Finally decided that for $20 I could get new batteries on
Ebay and just rebuild it.

What the OP is talking about is using a low-impedance power source to
burn open the whiskers that sometimes form on older NICAD batteries,
especially when they are left unused and uncharged for long periods
of time. Once the cells start whiskering, they almost always are
prone for it to happen again, the best thing to prevent/stop this is
to keep them permanently on a trickle charger. I have some very old
nicads, perhaps 30+ years old, that I still use in some tools that I
keep on trickle chargers. I know I am using power to keep them
charged, but the convenience of always having the tools ready when I
need them outweighs the small cost. When they were new, they were
very expensive so that is another reason I hate to discard them.

Actually I've read just the opposite. *That leaving them completely
discharged is the best way to store them.

I wouldn't believe that for a moment.

According to Panasonic, storing NiCads should be between 10 and 30
degrees F, and charged at least once a year. Never store the battery
dead.
NiMh batteries are a different story and can be stored long-term
either dead or fully charged, According to both Sony and Duracell you
may need to "reactivate" them by charge cycling - long term storage
between -20 and +35 F, 50% RH.

DO NOT store dead with a load connected.- Hide quoted text -

- Show quoted text -

And here's some sources that say they should be stored
discharged:

http://www.batterystuff.com/tutorial-NiCad.html

" When preparing to store NiCad batteries, be sure to discharge the
batteries fairly deeply. The range in recommendations is between 40%
and 0% charged when going into storage. "

http://www.saftbatteries.com/SAFT/Up...ft/PDF/tn1.pdf

http://users.frii.com/dlc/battery.htm-Hide quoted text -

- Show quoted text -

I would trust Panasonic more than some web site- Hide quoted text -

- Show quoted text -

Some website? One of those 3 websites was a tech data sheet
from a $750mil manufacturer that gives a tech data sheet
on storage for nicads used in aircraft. I think they would be
considered a credible source. And they clearly say to store them
fully
discharged.

As for Panasonic, what you are apparently trusting is the
previous posting of heresay regarding what Panasonic says
or doesn't say on the issue. Many times people read what
they want to read. If you have a link to what Panasonic
actually says, or anyone that says they should only be
placed in storage fully charged, I'd be happy to see it.