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After upgrading several Lenovo Drivers, I realized that the time left on the batteries is not showing properly. I have the laptop battery slotted in and UltraBay battery as well however the UltraBay battery is not added.


This issue appears after upgrading Power Manager driver to version 3.30.


Power Manager version 3.31 and above for Windows 7 / Vista fixes this issue

Power Manager version 1.89 and above for Windows XP fixes this issue.

Download link here.

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I have also upgraded all drivers and Utilities on my T400s running Windows 7. Power Manager is version 3.31 and it says: no battery installed

The icon in the task bar appears to show battery status correctly. It is only the Power Manager that says I have no battery. Any idea?