I've had my rMBP for about a month now but I've always wondered why the battery indicator at the top always says I have 3-4 hours right after a full charge when I unplug the power. Is this a faulty unit or is everyone else getting the same? I looked up the specs on Apple's website and it says " Up to 7 hours wireless web". And I'm not doing anything crazy (gaming etc). All I'm doing is connected to wifi and surfing.