Hey guys, so I just recently got a brand new MacBook Air 13" from Best Buy and I absolutely love it. However, I'm a bit unsure as to how to properly take care of the battery. Am I supposed to let it go down to < 20% before charging, or should I not let it get to less than 20%? Am I supposed to keep it on the charger? I have absolutely no idea, what do you all do to keep your battery healthy?