Mid2012 MBP Battery Life?

Have the same problem with the retina 13inch model. It's brand new and battery status is 'good'

That's not exeptable in this price range, due to the fact that all the reviews and tests say that they have about 6 hours of battery time while working..

When you first used the Mac, the battery controller had no idea of what you were going to do as well as how the battery would react to the load. So it put up a wildly optimistic estimate based on theoretical performance curves.

As time passed and the controller was able to measure real-world conditions for that specific battery and your particular workflow, it had better data on which to work up an estimate that was more accurate.

Then there's the battery, manufactured as per modern statistical quality control procedures. No two are alike, but enough within the ballpark for the maker to predict a reasonable guesstimate of their behavior. As time goes by, the guesstimate is replaced by reality. My MBP showed the battery to have 110% of max charge capacity when I first turned it on. Now, a year and 62 loadcycles later, it retains 99% of the max charge capacity expected for this model (6900 mAh).

May want to download the free Battery Health (off the App Store) or CoconutBattery (off MacUpdate.com) utilities, that will give you more info as to what the battery is up to without having to open the System Profiler.