Battery percentage changes suddenly depending on whether AC is plugged in

[Irfan]

The battery indicator in my Ubuntu 18.10 installed on Thinkpad shows 100% (Fully charged when plugged in) but when plugged out the battery shows 94%. Batteries are fine, no issues whatsoever with batteries.
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ProblemType: Bug
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DisplayManager: gdm3
DistroRelease: Ubuntu 18.10
InstallationDate: Installed on 2018-12-10 (3 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
Package: gnome-shell 3.30.1-2ubuntu1.18.10.1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 4.18.0-12.13-generic 4.18.17
Tags: cosmic
Uname: Linux 4.18.0-12-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
---
ProblemType: Bug
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DisplayManager: gdm3
DistroRelease: Ubuntu 18.10
InstallationDate: Installed on 2018-12-10 (4 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
Package: upower
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 4.18.0-12.13-generic 4.18.17
Tags: cosmic
Uname: Linux 4.18.0-12-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True

[Daniel van Vugt (vanvugt)]

Please run this command to send us more information about the system:

  apport-collect 1808193

[Irfan (irfan.hamid)]

apport information

[Irfan (irfan.hamid)]

apport information

[Irfan (irfan.hamid)]

apport information

[Irfan (irfan.hamid)]

apport information

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1808193

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Irfan (irfan.hamid)]

apport information

[Irfan (irfan.hamid)]

apport information

[Irfan (irfan.hamid)]

apport information

[Irfan (irfan.hamid)]

apport information

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 18.10 (cosmic) reached end-of-life on July 18, 2019.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed.