So my Macbook Air 11" was plugged in all night, was using it this morning plugged in. Battery was at 100%. Unplugged it but left it closed all day (7am to 4pm)opened up up and battery indicator says 9% is gone and it's busy charging away now. I have noticed this over a few days now. Thats a little harsh no? It's supposed to last 30 days or whatever when its sleeping but it won't last a week at this rate.