Battery life with Lion OS is very low, why?

I recently installed Lion OS, since then my bettery life has dropped from 7 hours to 2 1/2 when fully charged.  Seems like the processor os running full speed all the time.  In fact the computer is very hot, fan is running, etc.  Thoughts?

D Funk Orinda,
It could be a 3rd party software. For me it was the Adobe Flash Player / Safari causing my woes. I downloaded and installed the Adobe Flash Player 11 beta and all has been fine since. No more system lock ups, high CPU usage, CPU heat, fans running loud or battery life issues due to flash player in Safari. I also performed a 'clean' install using a DVD I created from Discussions in this forum.

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