It totally depends on how you use it and your power settings. I bet if you ran a CD or DVD non stop it would only last 4.5 hours. I have no intention of doing so ;) I get 6-8 hours on wifi running server software over my network. If I use dictation and print to a shared computer constantly, my battery goes fast..........
My rule of thumb now is, whatever the manufacturer says, cut it in half.



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