My rMB is my secondary machine, I use an iMac when I'm at my desk at home. But I was wondering if its bad to keep it plugged in to powe? I know it only takes 1-2 hours to charge but I was looking through the Power Nap function and it can do so much more if the MacBook is plugged in. So should I keep it plugged in for hours and hours (without using it) or unplug it as soon as it's done charging? What do you guys do?