Ubuntu – Battery Status not updating

Here are no problem it seems.
Soon, power consumption counted by Windows do not point actual state, because Windows is hungry and forced "to be a bit wrong" to user. It's my very subjective opinion.

Hovewer, it is very relativistic question due to very relative nature of an ACTUAL STATE term.

A very many ways exist to explain why for Windows 60% is actual but EQUAL for actuals Ubuntu 82%'s. Most simple is about differences between Windows and Ubuntu paradigms.

update 1

Try to test your environment with fwts :

sudo add-apt-repository ppa:firmware-testing-team/ppa-fwts-stable
sudo apt-get update
sudo apt-get install fwts

Read: wiki.ubuntu.com/Kernel/Reference/fwts

update 2

Thus battery.log shows that power ACPI interface disabled.
It means you have first solution for your problem by enabling power interface in BIOS.
Or if this behavior initiated by boot-parameter you need to find correct value.

update 3

Obviously booting parametrization have weight here.
New readings based on updates: UEFIBooting

Most actual parameters (WARNING! Use only correct parameters referred to your config) :

 acpi
 noefi
 acpi_osi
 apm  

Kernel boot parameters Documentation

update 4

Also you can try to test output parameters with acpi program:

sudo apt-get install acpi
acpi -V

Finally all my web surf point to: ThinkPad ACPI Extras Driver

And: Lenovo Diagnostics (Linux Bootable CD).

I have the same problem for ASUS Zenbook and resolved with:

edit grub:

sudo vi /etc/default/grub

change like below:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="
GRUB_CMDLINE_LINUX="acpi=force pcie_aspm=force drm.vblankoffdelay=1 i915.semaphores=1"

update grub:

sudo update-grub

and restart