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Re: Dead battery after storage on T400s

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Computer Nerd Kev <not@telling.you.invalid> wrote:
> bp@www.zefox.net wrote:
>> I can't see how the cells could be 18650, the pack is only about
>> half an inch thick. Even AA cells are too thick to fit.
> 
> OK, might be the flat cells like they use in phones.
> 
>> Maybe that's why replacement packs seem scarce.
> 
> Seems like Lenovo might still be making them actually. Quite a few
> sellers claiming to have genuine "Thinkpad battery 59+" in stock,
> if that's the right one.
> 

That must be laptopbatteryexpress.com. Not OEM, but Lenovo reports
out of stock on the numbers that might work: The battery I have is 
42t4690, apparently 42t4691 and 42t4688 will work.

With shipping a generic replacement is about $90, with only two ratings,
one awful and one good, from Amazon in the USA.

>> I looked for wake on LAN, but couldn't find it in the BIOS. Might it
>> be set in Windows 10?
> 
> I doubt it, usually it's set in the BIOS. I've seen the option on
> earlier Thinkpads, believe it or not the T400s is still a bit too
> new for me.
> 
>> Haven't seen it there, but I'm mostly unfamiliar
>> with Win10 and could easily miss it. I'm certain I didn't hit the power
>> button, but did unplug and plug the power jack and also open/close the
>> lid. Could either trigger a startup?
> 
> I wouldn't have thought so, unless the OS didn't really shut down
> fully after all.
> 
>> The machine stayed off all night, when I checked the battery this morning
>> it read 12.26 volts, same as last night. No parasite drain. Knowing now
>> where to test voltage direct on the battery I'm tempted to apply a small
>> light bulb load, say 2 amps, to do a capacity check independent of the
>> computer.
> 
> Not recommended. Over-discharge could kill it, or even cause it to
> catch fire when you try to charge it again (although the battery
> controller should prevent that).
> 
>> Any hint what the several intermediate contact on the battery do?
> 
> They're so the battery controller can talk to the PC and tell it
> things like why it doesn't want to charge because someone hooked
> a light bulb to it and over-discharged it.
> 

Point taken, I didn't intend to let it run down to dead.  Certainly
mistakes can be made, nonetheless. Having watched a couple of rundown
cycles it appears that both laptop and battery are working correctly,
with the battery having a little over one hour of endurance. That's ok
for the present. The core error I made was not realizing the power-off
button was only putting the machine to sleep. Now it's turning off
for real and does seem to remain off. Self-discharge isn't a problem,
after all is said and done.

Thanks for writing, and all your help!

bob prohaska

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Dead battery after storage on T400s bp@www.zefox.net - 2025-01-14 01:50 +0000
  Re: Dead battery after storage on T400s bp@www.zefox.net - 2025-01-14 18:11 +0000
    Re: Dead battery after storage on T400s not@telling.you.invalid (Computer Nerd Kev) - 2025-01-15 06:40 +1000
      Re: Dead battery after storage on T400s bp@www.zefox.net - 2025-01-15 17:25 +0000
        Re: Dead battery after storage on T400s Adrian Caspersz <email@here.invalid> - 2025-01-15 21:02 +0000
          Re: Dead battery after storage on T400s bp@www.zefox.net - 2025-01-15 22:03 +0000
        Re: Dead battery after storage on T400s not@telling.you.invalid (Computer Nerd Kev) - 2025-01-16 07:44 +1000
          Re: Dead battery after storage on T400s bp@www.zefox.net - 2025-01-15 22:45 +0000
            Re: Dead battery after storage on T400s Computer Nerd Kev <not@telling.you.invalid> - 2025-01-16 13:47 +1000
              Re: Dead battery after storage on T400s bp@www.zefox.net - 2025-01-16 16:10 +0000
                Re: Dead battery after storage on T400s Computer Nerd Kev <not@telling.you.invalid> - 2025-01-17 12:53 +1000
                Re: Dead battery after storage on T400s bp@www.zefox.net - 2025-01-17 04:26 +0000
                Re: Dead battery after storage on T400s bp@www.zefox.net - 2025-02-07 19:05 +0000
                Re: Dead battery after storage on T400s not@telling.you.invalid (Computer Nerd Kev) - 2025-02-08 07:49 +1000
                Re: Dead battery after storage on T400s bp@www.zefox.net - 2025-02-08 20:33 +0000
                Re: Dead battery after storage on T400s not@telling.you.invalid (Computer Nerd Kev) - 2025-02-09 09:54 +1000
                Re: Dead battery after storage on T400s bp@www.zefox.net - 2025-02-09 01:44 +0000

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