What do you guys suggest is the best battery practices in order to conserve your battery? for example, letting the battery drain all the way down before charging it back to 100%? leave or don't leave the computer plugged in even after the battery is full? Basically what is a good way to take care of your battery so it'll last longer. I just received my rMBP yesterday and want to take the utmost care of it since replacing the battery is not the cheapest thing. Thank you!