Since I downloaded OS X lion, why is my battery life on my Mac Book Pro suffered

Why has my battery life suffered, since I downloaded OS X Lion on my Mac Book Pro?    How can I increase the battery life?

Get gfxCardStatus. It is a free menu bar application that keeps track of which graphics card your MacBook Pro is using at any given time.
<http://www.macupdate.com/app/mac/33905/gfxcardstatus>
When you are running on the battery, you want to make sure you are using the "Integrated" graphics unit, as it is more power efficient.
You might also want to run Applications -> Utilities -> Activity Monitor and see if there are any processes which are consuming an excess amount of CPU non-stop.

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