From: rudolph wratten (cowthief_at_worldnet.att.net)
Date: Wed Apr 05 2000 - 07:14:09 EDT
The charge circuit is very simple, even for so-called "smart" batteries, you
see, everybody uses "building blocks" for batteries. There are evaluation
kits, boxes with 2 or 3 of each type of chip, that can be had for little, or
sometimes, no, cost. there are only 4 basic designs, everything else is just
a version of the same 4 stories.
From: Mark Gardiner <100550.3170_at_compuserve.com>
To: thinkpad <thinkpad_at_cs.utk.edu>
Date: Wednesday, April 05, 2000 4:26 AM
Subject: Re: how to rebuild a 770 Li-Ion battery pack?
I think you will find that the cells are OK, it is the chip circuit that
I rejuvenate a lot of laptop batteries and more often, the Li-ion circuits
the charge circuit off. A cynical person would suggest that the
manufacturers have built-in
You can't get circuitry parts either...
RE: Re: how to rebuild a 770 Li-Ion battery pack?
The easy way to find out what is inside.
Take the battery pack to a government building with x-ray machine near the
entrance. When they scan the thing, take notes. I however, feel that the
battery rebuild places might be a better bet, after all, you are going to
have to find the cells, and they are most likely high output matched cells,
and they might be non-standard in size.
From: Andrew Scott Beals <bandy_at_ricochet.net>
To: thinkpad_at_cs.utk.edu <thinkpad_at_cs.utk.edu>
Date: Monday, April 03, 2000 3:41 PM
Subject: how to rebuild a 770 Li-Ion battery pack?
>Well, some ebay bargains just aren't.. I'm now the proud owner of a
>totally dead 770 battery pack. My machine won't charge it -- tries for
>a few moments and then gives up.
>Is it worth $279.00 of my time to tear this thing apart and drop new
>cells into it? If so, could someone please give me a URL to a web site
>that tells me how IBM put this pack together so I can open it up without
>thanks in advance
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