Hi all!!! I'm new to here!!! I have a 2014 13 " MBA and I read many discussions and threads (here and other sites) in this question! But I can't decide in this question! So, is it good for my macbook air if i plugged in when it's fully charged or bad for the batteries? For example: when i at home i use my macbook air always plugged in. I read many theories, when always plugged in is bad for batteries. But i think, it's bad when my batteries has many cycle, many charging up to 100% and discharging to low level, 10-20%! What is the exact truth? Somebodies says, the ions needs to moving, so need some discharging! Im so confused! So, keep plugged in always, or sometimes do a moderate discharging (40-50%)?? Thanks for the answers!!!