Hi, I have recently purchase a rMBP late 2015. And I wonder how you use to charge it so you don't damage the battery? I have been having the charger connected on to the MBP during the day when I using it, but at night when I shutting it down ( power it off) I disconnect the charger ofc. Later when I'm going to start at school I'll use it on it's battery power during the day. Is this the right way to go or should I do something different to save the battery?