I didn't sew the original post, but in my country there is some factories
that open the pack in a special way and replace the dead cells.
I did it 3 year ago with electric drill and the batteries work very good
until now.

Regards

Tal Bejerano
AMC - ISRAEL


-----Original Message-----
From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On
Behalf Of Jinx
Sent: Sunday, June 02, 2002 12:19 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: Laptop battery fading


> I also immediately apply nominal charging current
> right after the zap - usually by using a suitable
> current limiting resistor in series with the 20 V
> charging supply. This resistor also serves to
> limit the charging current of the cap when the
> 20 V supply is turned-up.

An alternative to zapping is that you can apply a high
(eg 15V) voltage to the cell while keeping a very close
eye on a voltmeter. The cell will sit there for a short while,
perhaps a few seconds, perhaps a minute, soaking it up
until the voltage across it will rise suddenly. That's a good
time to take the 15V away very quickly;-)  Hopefully the
cell should take a normal charge after that. If this technique
doesn't work, zap it

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