Lenovo Z500 battery
I did not work for me in the beginning because Z500 didn't know it had a battery.
1. First do a clean install of Windows 7.
2. Install all the drivers only for Lenovo site and respect the restarts. Install Lenovo Energy Management last. Go to Lenovo Energy Management and set it for full Performance.
3. The indicator in the animation should be far right not center.
4. Go to Advanced Power Settings in Control Panel -> Lenovo Energy Management and hit ENABLE
5. Now you restart and you should be able to do the firmware update
6. If you cannot do the firmware update then uninstall LEM, remove ACPI from Device Manager, Reinstall LEM, Enable again.
7. If you cannot do the firmware update then try battery gauge reset in Safe Mode and remove ACPI after, and then Reinstall LEM, Enable.
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