So I just received my mac air today and it came charged at 90%. I then charged it to 100% and then let it charge an extra 30 min. When unplugged it from the charger, it lasted only 3 hours (from 100% to 10%) . During this time, I played about 20 minutes of awesomenauts, 10 minutes of tf2, and later I was installing some small apps such as audacity, sugarsynx, evernote, textwrangler, dropbox, etc. I also did light surfing with chrome when I was not installing applications. Is this normal for the first time use? For the last 35%, I played a movie to drain the battery, and it lasted I plan to charged it up to 100% again to see if the battery still drains quickly.