From: Oliver A. Durm (oliver.durm_at_gmx.de)
Date: Wed Aug 28 2002 - 16:22:57 EDT
Thanks for your reply, James !
I will put my comments between your lines below:
>
> LiOn batteries are not designed to have a constant charge applied to them, so in the
That's right - I am in the same opinion like you.
That's also the reason why there is normaly lots electronic inside a LiIon-Battery, too -
beside the cells - for controlling the charge / charge-state. (also at the Thinpad
Batteries)
>
> current Thinkpad that I own (A22p) I can look at the 'Fuel' program and watch the
> battery charge drop to about 95% and then watch the battery recharge to 100%. With the
> 600E that I gave to my wife, the cycle starts at about 98%. This will cause the
> battery to burn out faster.
That's an interesting information !
So either the uController on the Battery or the BIOS of the Thinkpad has some differences
on the A22p than at the TP600 concerning charging algorithm.
>
> So, the question that I have is: Was the discharge/recharge followed by a 'pulled'
> battery or was the battery left in while you ran the system from 'Mains' power? If so,
> this may be why your count appears to be low. The factor is to see how long the
> battery lasted after purchase. And the battery type that I have in the system is
> 02K7018 and has lasted over two years before displaying the "Blinking Orange" light
> syndrome. Looks like this battery was brand new when I bought the unit from IBM.
>
I've got two batteries in the past which passed away - one was inside the TP while
connected to the Mains power (and which should not be a problem of a well designed charging
circuitry) and at the second one which I purchased after the "death" of the first one I
always disconnected the Mains power so I charged and discharged it completly.
Generally, more than 500 charge/recharge cycles should be no problem working like this but
my 2nd one also died after about 50 cycles...which was about 4 months after purchasing.
In my opinion, that's definetly to short - knowing that the DELL-Laptop I am using at work
day by day is also connected often to Mains while fully charged and has never had a problem
like this.
Have you followed up the IBM-Discussion forum at the IBM-Thinkpad Page concerning
the sudden death of lots of TP600-Batteries which were complained by users in the past
months ?
I suppose one reason for this that some batteries are dying after a very short time of
usage or some others after 2 years is that probably different kind of qualities of the
cells were used...
My batteries here are:
12P4064 and 10L2158 and the Thinkpad is a TP600E-2646-4A0 with latest BIOS-Version.
A spare battery from IBM costs 180.- EURO which is quite a lot of money if you can use it
just for 50 cycles.....
thanks for your information and comments, James !
best regards,
Oliver
>
> James Mckenzie
>
> "Oliver A. Durm" wrote:
>
> > Hello Tae and the other TP600-Users,
> >
> > concerning the sudden death of TP600E-Batteries (you are not the only one) we
> > established two webpages with research information.
> > The battery issue is really a "black item" concerning TP600's....
> >
> > You can check the following webpages:
> > http://www.durm.org (and then click on the link "TP600E...")
> > and
> > http://www3.sympatico.ca/milnoc (and then also click on the link "TP600....")
> >
> > On the 2nd page you will find pictures of an opened TP600-Battery (not the
> > Ultraslimbay one)
> >
> > Everybody owning a TP600(E/X) is invited to submit his informations to Francois who
> > is the owner of this page and collects all the informations about the TP600's and
> > their batteries (+sudden death of batteries)
> >
> > best regards,
> > 73s,
> > Oliver (DL3SDW)
> >
> > Tae Hyong Kim schrieb:
> >
> > > Hello all,
> > >
> > > My main battery up and died the other day. No warning, just woke out
> > > of hibernation with only the ultralimbay batt holding a charge.
> > >
> > > I will say that the cover hadn't been closed all the way, so it
> > > hadn't spun down like I thought it had, and it was pretty warm near
> > > the main batt compartment.
> > >
> > > I downloaded the battery tester/utility from IBM's website, but
> > > trying to run it only produces a 'integer error div/0', so I can't
> > > even test it.
> > >
> > > But here's the kooky question - and I'm sure it's been asked before:
> > >
> > > I notice that the ultraslimbay batts go for a lot less than main batts on ebay.
> > >
> > > Has anyone been brave or curious enough to crack the batt cases to
> > > see if they both have the same battery configuration?
> > >
> > > Could one conceivably save some money simply by buying an
> > > ultraslimbay batt and switching the innards with a main batt and also
> > > keep the ultralimbay open for a CD ROM, or perhaps another
> > > ultraslimbay battery?
> > >
> > > I'm handy with an X-acto knife, and I happen to have both types of
> > > batteries here ...
> > >
> > > I'm just wondering if anyone has already pursued this idea before I
> > > take a whack at it.
> > >
> > > - Tae
> > >
> > > --
> > >
> > > "Inter caecos regnat luscus."
> >
> > --
> >
> > mit freundlichem Gruss / kind regards
> >
> > Oliver A. Durm
> >
> > HAM-Radio Callsign: DL3SDW / KC2ELI
> > HAM-PacketRadio : DL3SDW_at_DB0LX.#BW.DEU.EU
--mit freundlichem Gruss / kind regards
Oliver A. Durm
HAM-Radio Callsign: DL3SDW / KC2ELI HAM-PacketRadio : DL3SDW_at_DB0LX.#BW.DEU.EU eMail : dl3sdw_at_amsat.org or oliver_at_durm.org URL : http://www.durm.org or http://www.durm-online.de
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