Laptop battery help

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My Ibm thinkpad 770 has a small problem in that the battery does not
seem to want to charge at all!

Now I read that there could be a problem with "easy set up" mode and
that it`s also possible that the CMOS battery may be dead and that`s
the problem?

I know this isn`t an ibm 770 forum but if anyone could enlighten me to
"the ways of the laptop" (!) I`d be most grateful! (my 1st laptop)

I can find my way aroung a desktop with minimal trouble so I`m sure
it`s just a case of needing a little educating and a point in the
right direction!!!

Many thanks in advance to all you kind souls!!!

Re: Laptop battery help

: My Ibm thinkpad 770 has a small problem in that the battery does not
: seem to want to charge at all!

You mean the main laptop battery?  How old is the laptop?  Batteries
don't last forever - their life varies depending on how you use them.
My Toshiba Satellite's battery is almost junk after less than two
years use (I did not take care of it very well).  It used to last two
hours, now only 20 minutes.  I usually use the laptop plugged in and
that probably caused the early death of my battery.  

If the battery isn't charging now at all and recently held full
charge, there could be something wrong with the charger or the battery
terminals may need to be cleaned (pencil eraser).  Of course, if a new
battery works in the charger, you know the charger is working fine.

If your laptop is pretty new, the battery may be defective and still
under warranty.  If it's not under warranty, the battery may just be
fried.  Get a new battery.  Be prepared:  they aren't cheap.

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Re: Laptop battery help

ibm.ibmpc.thinkpad is the best source for thinkpad info, hints and tips...

770 batteries typically last about 2 yrs.


spendog wrote:
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The beatings will continue until morale improves.

Re: Laptop battery help

I use three different UseNet servers, and non of them carry this


Capt. 'Wild' Bill Kelso, USAAC wrote:
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Re: Laptop battery help

Angry American wrote:
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Well then, I guess you'll just have to do with the knowledge here.

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I am BillGatus of Borg.  Resistance is futile.  You will be assim
[General Protection Fault]

Re: Laptop battery help

Excuse my ignorance but how do I get to ibm.ibmpc.thinkpad?

Thanks capt. !

Re: Laptop battery help

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Is the battery a Lithium-Ion?  If so, it has been over discharged.  A
frequent cause of this is leaving a battery fitted to an otherwise unused
machine for too long.

On no account must any attempt be made to charge such a battery.  An
overdischarged battery develops internal shorts caused by copper coming out
of the chemistry.  Charging such a battery can cause it to rupture.  It is
not possible to extinguish the fire of a ruptured battery because it
generates its own oxygen.


Re: Laptop battery help

Electrical Fan Club wrote:
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coming out
It is

Ian, I beg to differ. I have taken apart several types of battery packs
(NiCd and Li-Ion). However, my experience has been that NiCd fails with
zero or negative voltage, and internal short, BUT Li-Ion on the other
hand has zero voltage, but with high-impedance/open circuit. In TP600
packs, the batteries are Li-Ion type 18650, with a circuit breaker just
under the positive terminal that some hacker has been able to reset
through the little vent hole on top. I've never tried it as I don't
want to mess around with Lithium.

Re: Laptop battery help

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Most of the Li-ion batteries I have come across have a PTC element built
into them to limit discharge current.  Unfortunately they only limit the
current outside of the battery, not internal shorts.  As the voltage drops
below 3.0 volts (2.6 volts for some formulations), the copper in the
chemistry is deposited everywhere inside the cells.  If thick enough, it can
give rise to an internal discharge sufficiently high to cause rupturing of
the cell, once the cell is charged.

The problem is that the manufacturers will not part with information such as
this, and as a result, many a person has attempted to recover overdischarged
batteries, through ignorance of what is actually happening.  Many get away
with it, but not all.  There is a correct procedure to be followed, not to
ensure the greatest chance of success, but to ensure that any failure causes
the minimum damage.  If anyone is interested, I'll post the procedure, but I
have to stress, that I do not recommend recovering such a battery.  Throw it
away* - it's safer.


*In the appropriate recycling facility of course.

Re: Laptop battery help

Electrical Fan Club wrote:
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Post the procedure.

but I
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Re: Laptop battery help

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such as

The following procedure for recovering overdischarged Li-ion batteries is
not recommended either by myself or the battery manufacturers.

The correct procedure for an over-discharged Li-ion battery is to dispose of
it in the correct manner.  I accept no responsibility for any undesired
results from following this procedure.  I provide the information, only
because in its absence, attempts at recovery are likely to be made in less
than safe conditions.


WARNING: Lithium-ion batteries contain an electrolyte that is highly
inflammable.  Lithium-ion batteries can under conditions of over-charging
also contain Lithium metal that will spontaneously ignite on contact with
oxygen or air.  Lithium-ion batteries can under these same adverse
conditions generate internal oxygen gas.  Thus over charging will eventually
result in explosive rupturing of the case.  The resultant fire is impossible
to extinguish.  Fire fighting activity should be limited to preventing any
flammable material in the flame path from burning.

NOTE: Lithium Polymer (more correctly Lithium-ion-Polymer) batteries have
dispensed with the flammable solvent for the electrolyte, and although any
fire will be smaller, the risk has not been eliminated.

This procedure can only be applied if the battery has been overdischarged
for a few days at most.  If the time period of overdisharge is not known or


1). Find a fire proof location where the battery can be charged, that is as
at least 2 metres from any combustible material.  Note that it may be
necessary to charge the battery in its parent device.  Note: that any
rupture point will produce an oxygen fuelled jet of flame several feet long.

2). While monitoring the individual cell's terminal voltage, charge the
battery in the location mentioned in para 1, at 0.1 CmA (e.g. charge a 1 Ah
battery at 0.1 A), while monitoring the terminal voltage.  Terminate the
charge when the terminal voltage of any cell is 3.1 volts.  Wait 15 minutes
and then note the cell voltages.

3). Leave the battery in this location for 24 hours.  If the battery is
still in one piece at the end of this period, compare the cell voltages with
those noted in para 2.  If any cell voltage is significantly lower than the
previously noted value (by 0.2 volts), then dispose of the battery.

4). The battery should now be charged using its normal charger in the
location referred to in para 1.  Note that if this parent device is
something expensive, there is a risk that a battery rupture will destroy
that device.

5).  When the charger indicates the termination of the constant current part
of the cycle, terminate the charge.  DO NOT wait the extra hour for the
constant voltage part of the cycle to complete.  Leave the battery in the
fire proof location for 24 hours.  Bear in mind, that should you wish to
remove the battery from the expensive charging device, that there is a risk
of rupture while handling it.

6). If the battery is still intact, it may be discharged and recharged
normally, and then returned to service.  The battery must be indelibly
marked that it has been subject to this procedure.  This procedure must
NEVER be carried out again on the same battery.

It may be noted that the battery indicator may show a fully charged battery
as being only 75-80% charged (dependant on the accuracy and resolution of
the indicator), but almost full capacity should be available.  This is a
quirk of the chemistry.  The useful life of the battery will be shortened

This information has been compiled from many sources, none of whom wish to
be credited with any endorsement.


Re: Laptop battery help

Ok, so it couldn`t be the CMOS battery then?  I read somewhere that a
flat CMOS battery can stop your actual battery from charging?  Or did
I read that wrong?

And yeah, how do you get to that ibm.ibmnet bloody thing?!!!

Re: Laptop battery help

spendog wrote:
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Tell us, how did you get to THIS newsgroup?  Was it installed from the factory?

I am BillGatus of Borg.  Resistance is futile.  You will be assim
[General Protection Fault]

Re: Laptop battery help

Whoa!!!  ok, my bad - I told you I was a noob man!!!

Ok, so a search in google found the thing but I still can`t
tell if this CMOS battery thing is a whole load of crap or if it
might be feasible.

Any help will be gratefully received - feel free to mock my noob
status if it helps!!!

Re: Laptop battery help

spendog wrote:
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The CMOS battery is the little 3volt coin battery that goes into the holder
under the RAM cover.  Replace it if you keep getting the 161/163/173/192 error
codes on startup.

Replace the 770 main battery if it is more than 2 yrs old.

Do - not - try to charge the battery if the charging lite just blinks and
blinks.  Do - not - leave the battery in place trying to get it to charge, you
will burn up the DC-Dc board and have to replace it, and the 770's are not
fun/easy to disassemble.

I am BillGatus of Borg.  Resistance is futile.  You will be assim
[General Protection Fault]

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