HT1629 Why does my battery drain quickly?

I just charged it 2 hours ago and its 19% all i have been doing is surfing the net!
Just wondering if anyone else has this problem? mine is the macbook pro mid 2012 2.9ghz
THANKS!

I have the same computer and I'm having the same issue.  My battery doesn't even last me through class anymore when it used to last me through all of my classes.  It also gets very hot when I am really not doing much to stress the CPU.  This all started after the latest update to 10.8.5.  I hope this gets resolved because my computer has become useless to me now. 

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