Dead rechargeable batteries

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Article #2947

#2947

From: Jukka Marin
Date: Thu, 16 Apr 1992 06:08

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I have a portable CD player (Sony) with rechargeable batteries (not NiCd
but some kind of a sealed lead battery).  I didn't use the batteries for
6-8 months and now their internal impedance seems to be very high.  The
batteries were fully charged and their rest voltage is still about 4V
(the same as their nominal voltage) but their impedance is so high that
even when short-circuited they supply only 20-40mA of current.

Is there any way to wake up the batteries?  I tried charging them for
some time but they don't take much charge as the charging current is
very small at voltages below 6V.  There has to be a way...

Please e-mail as I don't follow this group all the time.  Thank you!

  Jukka Marin
  jmarin@messi.uku.fi


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| Mail: Jukka Marin           | E-Mail: jmarin@messi@uku.fi                |
|       Metsurintie 17 B 8    |         There's God above computers -      |
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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!news.funet.fi!luotsi.uku.fi!messi.uku.fi!jmarin
From: jmarin@messi.uku.fi (Jukka Marin)
Newsgroups: sci.electronics
Subject: Dead rechargeable batteries
Message-ID: <1992Apr16.060817.5235@luotsi.uku.fi>
Date: 16 Apr 92 06:08:17 GMT
Sender: news@luotsi.uku.fi
Organization: University of Kuopio, Finland
Lines: 22
Originator: jmarin@messi.uku.fi