Macbook Pro 15 2.2ghz Battery Life?

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i installed lion today on 2011 macbook pro 2.2ghz 15". when unplug machine , let sit idle 5 mins half brightness , check battery life getting around 4 hours.:confused: laptop 1 month old 19 charge cycles. there wrong? or can fix in settings? have did search , couldn't find model.

thanks!
 

battery life indicator estimates based on usage. if you're running vid show lesser amount if you're browsing web. you're fine - no need freak out. search macrumors guides more details.
 


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