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hagbard
Fanfold Paper
Posts: 6
Registered: ‎07-03-2018
Location: CA
Views: 98
Message 1 of 4

T440 shuts down when one battery is drained

When battery #2 is nearly drained, I get a message that the computer has low power (it says 48%), then a few minutes later it shuts down.  I turn it back on, check the battery status, says number #2 battery is 5%, says the other is around 60%.  Five minutes later it shuts down again.  Turn it back on, and it runs over a half hour before I shut the system down.  Why is it not switching over to the nearly full  battery?  Where should I be looking to fix this?

JimBobMC
Token Ring
Posts: 194
Registered: ‎10-27-2016
Location: US
Views: 82
Message 2 of 4

Re: T440 shuts down when one battery is drained

If you recently upgraded to the 1803 version of Windows 10 that may be what caused it.

 

When you click microsoft battery icon on the task bar does it show both batteries?

If you look in Device Manager are both batteries listed?

 

The windows 10 - 1803 update screwed up a lot of Thinkpads with two batteries.

So, I can see no downside to trying this fix, it fixed my T480 with dual batteries:

 

 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.
hagbard
Fanfold Paper
Posts: 6
Registered: ‎07-03-2018
Location: CA
Views: 63
Message 3 of 4

Re: T440 shuts down when one battery is drained

Trying it again to see if its a fluke if not I'll dive into your solution.  Regardless, I'll report back the results.

hagbard
Fanfold Paper
Posts: 6
Registered: ‎07-03-2018
Location: CA
Views: 30
Message 4 of 4

Re: T440 shuts down when one battery is drained

Seems to have cleared itself up.

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