Hi,
Thanks for sharing your concern on Microsoft community.
We appreciate you for trying the troubleshooting steps.
As the issue still persists, I suggest you to try creating a new power plan and check if it helps
Refer to the below link:
http://windows.microsoft.com/en-us/windows/power-plans-faq#1TC=windows-8
Note: Applies to Windows 10 as well.
Hope it helps, reply to us with the status of your issue. We will be happy to assist you.
I have same problem with my brand new Lenovo laptop. The link above has nothing to do withbattery. This is what I did;
I changed "Power button" function to put the computer to Hibernate mode and "Closing the lid" to put the computer in Sleep Mode.
This way, when I leave the laptop overnight and I don't want to shut it off, the power button saves me a lot of time as well as battery.