Thank you for providing the details.

Here's some troubleshooting steps you can try to remedy the issue:

Firstly, try to do a few static discharges of the device.

Static Discharge
- Remove all cables attached to the device (ac adapter/power, hdmi, external mouse/keyboard, etc)
- Ensure device is switched OFF
- Hold down power button for 60 seconds
- Re-attach all cables
- Connect the AC Adapter, then let the device charge for about 2 minutes (if it does) then start up as usual.

- If the issue persists, continue to step 1.

Step 1. Disable Automatic Hardware drivers update
- Right click the Windows Icon, select the "Search" Function.
- Type "Control Panel" and select "Small icons" or "Large Icons" in the "View By" top right.
- Click the "System Icon"
- Navigate to "Advanced System Settings" -> "Hardware"
- Click "Device Installation Settings" and Select "No"
**This will prevent Windows from interfering with your hardware drivers in future updates, but keep crucial security updates rolling.

Step 2. Reinstall Battery drivers
- Press Windows Key + X, select Device Manager
- Now click Batteries in the Device Manager window.
- Next, you should right-click Microsoft ACPI-Compliant Control Method Battery and select Uninstall from the context menu.
- Click Uninstall to confirm.
- Restart the device and have Windows install the generic driver type for the battery to be installed.

Step 3. Updating the System Board drivers.
Make sure you have the newest Chipset, Power Management drivers for your device:  
You can find and install the newest drivers from the Lenovo Support Page
Just plot in the serial number for your device and hit enter, might have to hit it twice. Then head to Drivers & Software then the Chipset and Power Management section.

Step 4. Try to recalibrate the battery with One Key Optimizer.

Download the One Key Optimizer from this link and install it.

To calibrate battery in the OneKey Optimizer.
1. Start the application - there should be a light blue icon on the desktop after you installed it.
2. Click on the tab named "Save energy".
3. Underneath "Save energy" there are 3 more tabs. Click on battery saving.
4. Click Calibrate
Now the calibration will start, note that this can take several hours

If nothing seems to help better the battery time, then I'd suggest rolling the BIOS update back to it's previous version and wait until a newer BIOS version comes down the line that might solve this issue.

BIOS Back Flash
- Completely shut down the device.  
- Press the Novo Button :  It is the small reset hole on most devices that you need a unfolded paperclip to reach.
- If you're device does not have a Novo Button, then pressing F1 or F2 repeatedly on startup will take you into the BIOS. 
- In the "Configuration" Tab, set "BIOS Back Flash" to "Enabled"
- Click the "Exit" Tab and click "Save Exiting Changes" or Press "F10"
- PC will Restart and enter the Windows Environment.
- Head over to the Support Page for your device.
- Under Drivers & Software, Manual Update, then BIOS section, you can find the latest BIOS version.  
- Expand the BIOS driver with the down arrow. Right Click then select "Copy Link Address"
- Paste it into the URL section of the browser
- Change the nr of the bios version  (ex: 8HCN36WW  to 8HCN35WW or 8HCN34WW) and hit enter.
- Do this in the URL input section of the browser until you find the previous BIOS version to download.
- Right click the file and select "Run as Administrator"
**Note: You can also attach the file to a USB flash drive, boot from USB through BIOS and then run it that way.
**Note: Make sure the AC adapter is connected and that you have at least 30% battery charge when performing this update.

Regards

Voithos