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Since upgrading to Lion, my battery now reads around 3:30hrs on a full charge. Before the upgrade, it use to read 7+hrs. Something definitely not right here and having done some further research, there's quite a few others encountering similar problems. Hopefully Apple will be able to provide a fix soon.
 
Give it some time as it's probably rebuilding the spotlight index. If not, try and see if an smc reset helps.
 
I had the same issue after upgrading to lion. Found resolution on apple forum to reset power management.

1. Turn off the computer.

2. Hold down Ctrl+Option+shift+power button

3. Hold all buttons for at least ten seconds.

4. power back on the computer.
 
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