If these will not work do also uninstall/reinstall the battery driver.
- Go to Device Manager and uninstall the "microsoft acpi-compliant control method battery".
- Reboot the laptop after uninstalling the driver and it should reinstall the driver automatically.
- After the reboot do test your laptop again and see if the same problem will persist or not.
- If all these will not work the problem lies in the battery itself and replacing it would be the only solution.