Battery Issue

Hey guys, i purchased a macbook pro 13" a few months ago (my first mac) and as everybody knows the battery is suppose to last 7hr , thats how it was advertised at least. The first couple of weeks i was getting around 5-6 hours which is not bad...i had no complaints. But lately i get no more then 430 hours if not 4 hours. I tried closing all applications and seeing whats running but even on a fresh boot with just safari i still dont any close to 7hr. What do you guys think could of caused this ?

Please do a search of the site...this subject has been "Q&Aed" many times.

- Nick