T500 Battery Life post Windows 7 Upgrade

Have a 6 month old T500 which I love.  Always had good battery life (can't remember the duration, but never had an issue with battery life).
Earlier this week, I did the Windows 7 Upgrade (machine originally came with Windows Vista OS).  After doing the upgrade, I've noticed a substantial decrease in battery life (now lasts for about 2 hours max).
Have reinstalled ThinkVantage Power Manager and Toolbox applications, but that hasn't helped.  Also did power meter reset, but that doesn't seemed to have helped.
Has anyone else experienced this?  Any suggestions out there?

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