Replacement battery still dropping considerably on Mountain Lion.

Just replaced my battery on a late 2008 MacBook Pro with Mountain Lion and within 25 minutes went from 32% (when the Apple Genius Bar replaced it) to 8%. I have had the same issue like this already, with an Apple representative contacting me to try and figure it out.  Why does it keep doing this?  Has this happened to anybody else?
Thanks.

UPDATE: Charged the battery full last night and within 2 hours by battery life is at 40%.

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