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Re: Dead battery after storage on T400s

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bp@www.zefox.net wrote:
> The T400s I was given  a few years ago successfully upgraded to 
> Windows 10 and seemed to work reasonably well for its age.
> 
> However, after not-very-prolonged storage it's absolutely dead,
> not responding to the power button until it's plugged into an
> AC adapter. This is despite being put away with a full charge
> and being shut down, not set to sleep or hibernate 
> 
> Once it comes back up it charges the battery in an hour or two
> and claims to have about 90 minutes of runtime with the battery
> at 90-ish percent of full. That seems rather brief, but it's an
> old machine. I don't mind plugging it in, but stone-dead from
> the start is sort of a nuisance. 
> 
> What's reasonable to expect? The hardware manual seems mute on
> the subject. I've looked into replacing the battery, which is
> marked 42t4690, 11.1 volts 3.9AH 44WH. It appears to be available
> on Amazon, with admittedly vague descriptions. Still, it would be 
> nice to know how to test the battery before replacing it. There are
> far too many contacts to start probing blindly. 
> 
> Thanks for reading, and any suggestions!

Turns out I searched the manual for "battery testing" and variations,
but the test points were revealed under   "charging". My bad....

With the battery status at 99% the removed battery measures 12.2 volts,
which seems pretty good. The run-time still seems short however.

It further turns out that the power button was set to sleep, not shutdown.
That's fixed now, so maybe it won't be totally dead after storage.

One pleasant surprise is that the machine seems to work fine with the
battery physically removed. In the worst case I can use it that way.
I'll keep the battery out overnight to see how much the voltage drops.
Can't find a date code on the battery, if anybody knows a way to check
that would be helpful.

Thanks for reading, apologies for the misinformed questions!

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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