So if the battery in this goes kaput after lets say 3 years, and all of us take it to Apple to replace battery, how much is it going to cost? In my earlier macbook I could just get the battery from apple or eBay and replace it myself. Also, when I wake the macbook from sleep I see about 15% or so battery drain each instance, be it overnight or during the day. Is that normal, are you noticing such drops as well? I'm shutting it off for the time being because of this.