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doupadan
Paper Tape
Posts: 2
Registered: ‎09-13-2018
Location: GB
Views: 319
Message 1 of 4

Thinkpad T400 battery issue!

H all,

 

I am having issues with my battery on my T400. The orage light started flashing when I installed windows 10.

In the windows task bar it shows: plugged in and charging.

When I remove AC power screen flashes 'battery critically low' and turns off.

I have purchased a new OEM 33+ battery and still no change apart from windows task bar shows: plugged in and not charging.

 

Does anyone know what could be causing this issue???

 

Many thanks in advance

 

dan

 

 

JimBobMC
802.11n
Posts: 207
Registered: ‎10-27-2016
Location: US
Views: 289
Message 2 of 4

Re: Thinkpad T400 battery issue!

Does your system have two batteries or only one?

 

Do the battery(s) and the charger show up in device manager?

 

~~~~~~~~~~~~

Here is a procedure that has helped a number of people. If you do not have a 2nd internal battery skip those steps!

 

~~~~~~~~~~~~~~~~~~~~

 

 I may have some extra unnecessary steps in here, but I wanted to be sure I didn't screw it up:

  • Open the Device Manager by searching for it or right-clicking the Start button and selecting Device Manager.
  • Click Batteries on the list to expand it and you should see two items (maybe three items – if your machine is equipped with two batteries there may be two, but on my machine which does have two batteries only one was displayed) Anyway:
  • You will see: : Microsoft AC Adapter
  •  And one or two  Microsoft ACPI-Compliant Control Method Battery (s)
  • Right-click on each item and choose Uninstall device. Yes, you are uninstalling your laptop's battery drivers, but don't worry because they will automatically be reinstalled when you restart your laptop.
  • Shut down your laptop.
  • Unplug the power cable from your laptop.
  • Power on the laptop (running on batteries now) and enter BIOS
  • Go to:  Config --> Power  -->  and select the option to “Disable built-in battery”
  • You will get a prompt that says the machine will power down if you continue.
  • Acknowledge the prompt  --> the machine shuts down.
  • If your laptop has a second removable battery, remove it.
  • Plug in the charger cable to your laptop, this puts the internal battery back on-line and powers up the system.
  • Let it stabilize at the desktop – if you want to check Device Manager you should now see the AC adapter and ONE battery (the internal battery, the 2nd battery is uninstalled and laying on your desk at this point).
  • Shut down the machine
  •  unplug the charger cable
  • install the 2nd external battery, making sure it it latched and then locked in place.
  • plug the charger cable back in
  • power on the laptop and boot to the desktop
  • At this point my machine was fixed – both batteries and the AC adapter were registered in Device Manager, and both batteries once again showed up as separate line items in the Microsoft battery taskbar item and functioned properly.
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~~
Some years back I worked for IBM, currently I do not work for,
nor do I speak for Lenovo or IBM.
doupadan
Paper Tape
Posts: 2
Registered: ‎09-13-2018
Location: GB
Views: 278
Message 3 of 4

Re: Thinkpad T400 battery issue!

Hi,

 

I only have a small round internal battery for clock etc. and the removable battery (x2) at the back of laptop.

I done as you asked and I found I did not have the option to disable battery in bios.

This then voided all other steps.

 

Luckily I had ordered another battery (non OEM) from ebay.

When I fitted this to my laptop the light went green straight away.

 

I take it that both the other batteries have damaged cells???

Do you know if there is a way of testing these?

 

Many thanks for your help!!

 

dan

 

JimBobMC
802.11n
Posts: 207
Registered: ‎10-27-2016
Location: US
Views: 274
Message 4 of 4

Re: Thinkpad T400 battery issue!

I am not that familar with the internals of the T400, so yes...

Apparently you only had the one external battery.

 

The Lenovo Vantage tool has a battery check/reset function in it:

 

Hardware settings -->  Battery -->  Power gauge reset

 

follow those instrucctions,

and once the "reset" is complete it will tell you details about the battery condition.

In you case it may not be very helpful but ... it cost nothing to give it a go   ;-)

If a post answers your question, please mark it as an ”Accepted Solution“!
If a post helps you, please click the star to give it a Kudo
~~
Some years back I worked for IBM, currently I do not work for,
nor do I speak for Lenovo or IBM.

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