MBP running on battery doesn't go to sleep when closing lid

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I have a late 2011 MBP running Lion 10.7.4. When I have it plugged into the wall and I close the lid, it goes to sleep. But when it's on the battery and I close the lid, it does not go to sleep. Why is that?
 
Joined
Dec 19, 2009
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Your Mac's Specs
MBP 13, 2.4, 8GB, 120GB SSD OCZ
Go to System Preference>Print&Scan>Click 'Sharing Preferences'>under Service: take note of what's checked, then un-checked all> closed System Preferences> re-open System Pref and go back to Service then rechecked what was originally checked.

This works for mine and some but not all. Also make sure there's no pending print job in any/all print queue.
 

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