Hi, I recently got the 2013 macbook air and I'm really impressed with battery life so far, it really lasts all day as far as I can tell, with over 50% of the battery remaining when I get home. I generally don't work with CPU intensive tasks (writing & browsing mostly, some music & videos too). However now when I'm working more irregular hours I'm trying to gauge how much time I have remaining and I found the time remaining indicator but I'm not sure how reliable it is. It shows about 4hrs left at about 75%, I thought that sounded a little low. However just after I took that screenshot it jumped to 5hrs, and when I'mm looking right now it's at 5:30, the remaining time is increasing while the battery is slowly decreasing. I know that these machines comes calibrated because the percentage itself seems in order. Is this normal or is there an 'easy fix'?