laptop batteries (Thinkpad 500) ???

From: Joe R. <rigdonj_at_cfl.rr.com>
Date: Fri Jul 30 10:37:22 2004

At 08:33 AM 7/30/04 +0200, you wrote:
>I have the 600e.
>Right now the battery is dead and won't take a charge.
>If I do send the pack out to replace the cells will this
>problem come back since it seems to relate to
>some charging-logic feature built into the pack design?

  Quite possibly. I'm finding out that a lot of the problems in NHM and
Li-ion batteries are due to the circuitry in the battery packs and not the
batteries themselves. I've been looking for an extended battery for my Dell
Lattitude LM laptop. Recently I found 12 of them in a surplus store and I
bought them all. NONE of them works even though they looked new and unused!
I've even opened a couple of them up and charged the batteries with a small
regulated power supply but the pack still has no output and the computer
doesn't recognze that it's even installed and it doesn't appear tobe
getting any charging curent via the computer and standard charger. There
is a LOT of circuitry in those packs. I expect the parts count is well over
100 devices including many ICs (and everything is surface mount).

    Joe
Received on Fri Jul 30 2004 - 10:37:22 BST