From: William Van Tuyl (wvantuyl_at_iso.net)
Date: Fri Dec 15 2000 - 12:04:54 EST
The battery is listed as an intelligent Litium-Ion so there is circuitry inside
the battery case. You may be measuring that. Try looking in the Hardware
Maintenance Manual.
ftp://ftp.pc.ibm.com/pub/pccbbs/mobiles/09n1033.pdf
Bill
Edwin A Camin wrote:
> Thanks for the suggestion, but the AC adapter works fine. When it is
> intermittent, without a battery, the operating system would vaporize and
> require re-booting the system. What I need is to find out is it normal, when
> measuring the battery pins on my TP600, for the two end pins to read 0
> volts? I thought that maybe the middle two pins are a switch enabling the
> charging unit? I'd just as soon not short them out expermenting and them
> blow some traces on the PC board.
>
> If the two outer pins on the TP600 read a voltage higher than the battery
> voltage I would know for sure that the TP was working and my battery was
> dead. As it is, I get no voltage from the TP. From my past experience as a
> Product Safety Engr, I know that it's not wise to mess with Lithium batterys
> by charging them from another source. I have often pumped huge currents into
> NiCd batterys safely and reversed them but I know it would be unwise to do
> it to Lithiums. My TP battery reads 0 volts and 0 ohms on the highest
> scale. That indicates open! Are the middle pins a switch? If one cell went
> bad I think I would at least read megaohms leakage.
>
> Ed
> ----- Original Message -----
> From: "Not Me" <notme_at_itr.com>
> To: "Edwin A Camin" <camin_at_ed-camin.com>; "ThinkPad List"
> <thinkpad_at_cs.utk.edu>
> Sent: Friday, December 15, 2000 1:05 AM
> Subject: Re: TP600 battery
>
> > At 04:18 PM 12/14/2000 -0500, Edwin A Camin wrote:
> > >>>>
> > My almost fully charged battery ceased operating instantly. No
> > warning, etc. The guage shows 0 left. I removed the battery and
> > measure 0 volts between + & - . With the battery removed, I measured
> > the voltage on the TP and it too was 0 volts indicating that the unit
> > wasn't charging.
> >
> > What I don't know is: are the two middle pins different voltages or
> > maybe a shorting connection? How can I determine if my TP is not
> > charging or if the battery has gone south?
> > <<<<
> >
> >
> > It's possible that your AC adapter is defective. I have just had that
> > experience on my ThinkPad 600E and it was really bizarre.
> >
> > What happened with my AC adapter is the wire broke from bending just
> > ahead of the strain relief on the plug that goes into the ThinkPad.
> >
> > The LED would glow amber (charging) or green (battery power)
> > depending on how I moved the computer or the AC adapter. Of course
> > either of these was moving the wire around which was either making
> > contact or not.
> >
> > It might be useful to check the output of your AC adapter.
> >
> > IBM is sending me a replacement under warranty, but I am still
> > dissatisfied. The new AC adapter will take a minimum of 5 business
> > days to reach me. Of course ThinkPad 600E batteries have a battery
> > life considerably less than five business days. If I did not have the
> > AC adapter from my ThinkPad 560X that I can use on the 600E, I would
> > be up a well known without a paddle.
> >
> >
> > >>>>
> >
> >
> > I can wiggle the battery and it either makes the charging light
> > flash, stay lit or go out. No matter what the light indicates, the
> > battery does not charge.
> >
> > Does anyone have an idea how to diagnose my problem?
> >
> > Ed
> >
> > <<<<
> >
> >
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