Hello, Had my rMBP for about 3 days now. First 2 days, battery life was exactley as expected. But last night I totally powered the MBP off, and since starting it this morning battery has been decreasing faster than I would expect. For example, right now I am just browsing the web and download a 700Mb file from the net which will take 30minutes. I'm on 25% battery life, and it says I have 40 minutes left ? If you extrapolate this information, you can deduce at this rate of discharge a 100% full charge would last about 3.5 hours. That seems like half of what it should be ? The apps I have open are Finder, App Store, Google, Chrome Canary and that is all - at least to my knowledge looking at the dock bar (It's my first time using OS X so I am not massively knowledgeable). My screen brightness is at 50%, key backlighting off, nothing plugged into USB, and no music playing. Any ideas ?