Just got my macbook air in late December. I have been using it for a month now. I love everything about it except the battery life. I feel like I have a defected battery in my air. It only gets around 4 hours of battery after fully charged. I even dimmed my screen down to one or two bar and I turned off the bluetooth and the battery life still says its getting 4 hours. I don't know what to do. Should I call Apple and say they should replace it? How long does your battery last in your macbook air?