Battery life with os x 10.8? Dies SO fast?

So I just upgraded to os x 10.8.0 today and when I initially bought my macbook pro, the battery life was kinda already pretty bad. It's a 2009 model that I bought off of ebay and the user said he had replaced the battery 2 months ago (so around April or so). He said that the battery would last 5-6 hours with average use (surfing the web, youtube, facebook, etc.). He completed wiped the hard drive clean before sending me the laptop and when I got it, I installed Snow Leopard and the battery life was CRAP. it lasted me maybe 3.5-4 hours. So i emailed him and he said that he had the most recent operating system before, but he wiped it clean to send to me and included the snow leopard installation discs. So, I searched it on google and everywhere and I still don't know why. I thought that upgrading to 10.8 would help, but it's exactly the same. My laptop is currently on the lowest brightness before it goes completely black, I'm watching a youtube vid, on facebook, and typing this. My battery went from 100% to 86% in 30 minutes. 30 minutes! That's ridiculous! Would upgrading to 10.8.1 or 10.8.2 or even to mountain lion help?? I don't know what to do!!

Hello,
Thanks for your suggestions.
I've resolved this problem.
As i guessed, the cable connection between the samsung lcd monitor and the mac mini was the source of the problem.
I bought a DVI cable, right on replacing the D-Sub cable into new DVI one, it's gone.
I feel lucky because i don't know what was the exact problem but it's fixed.

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