It´s not usual around here, but this can be useful for lost Thinkpad users in the world of problems with Lenovo´s Thinkpad Power Manager. Sometimes, when this little tool is not working as it should, you may want to uninstall Power Manager in Windows 7, 8 or even 10 (I don´t know cause never used it), and install it again. If "cannot run on this system" message shows up do this:
To uninstall, go to C:\Program Files (x86)\Common Files\InstallShield\Engine\6\Intel 32 and right click on IKernel.exe, click the compatibility tab and choose Windows XP - Service Pack 2.
To install it again, disable the compatibility mode, returning to the native windows mode.
You should uninstall Lenovo Power Management Driver and Power Manager
reboot and install the latest versions, to solve stupid battery management problems, like when you just can´t choose some maintenance modes ("optimize for battery health", etc).