Battery Life on my 17" MacBook Pro

Hey guys,
So I just bought a early 2011 17" MacBook Pro and was wondering what the battery life should be like. I have the brightness on half, keyboard lights on full, and I have been on facebook, apple, and watching a movie, and the battery life is already on 63%. I don't know if this is normal, or is there something wrong with my battery? I called applecare and they said that it just depends on usage, but I'm still kind of worried because the computer was $2458 and I want to make sure that everything it in check for this kinda of money.
Please answer/reply soon!!!!
Alexander

So would what I was doing be considered heavy usage? Thanks for answering
Depends.  Screen brightness on half is good, but keyboard lights on isn't.  If you're using the internet, presumably you're doing that wirelessly, and having AirPort turned on drains power faster due to the need to constantly broadcast radio signals.  (Bluetooth is the same.)  Watching a movie isn't a low-power thing to do, and if you were watching it from a DVD in the optical drive, keeping that spinning eats even more power.
What you were doing isn't as high a usage as, say, playing a graphically-intense 3D game, but it's not something that will help your battery last longer either.

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