Ok, this is going to sound really stupid, but I'm not sure Power Manager works properly.
I am running Windows 8, which means .NET 3.5 is not installed, which Power Manager requires. However, PM installed fine, though it gave a warning about .NET. However, though it has added power profiles and I can right click on the Lenovo Battery meter and select Battery Stretch, it does not allow me to "Launch" the Power Manager window. That prevents me from accessing other settings. Battery meter constantly (Lenovo and Windows) constantly shows 100% and doesn't appear to be charging/discharging as you mentioned.
I've tried all ways to install .NET framework 3.5 (including running the command prompt as well as an executable I download from Microsoft's site), but it just doesn't happen. And on my WiFi at University, download size is limited to 150MB, which is too small for the 231 MB .NET update through Windows Update. I managed to download the executable through Tor, but it doesn't work on Windows 8.
This is a bit off topic, sorry.