I mean if you check Apple's website and their recommendations on battery care I believe they say to run their laptops on battery every so often. I believe it's two-three times a week. Or maybe it's a month, again I don't quite remember off the top of my head I'm sure if you google it you'll be able to find it. So in short keeping it plugged in all the time is bad, you have to use it on battery for at least a few hours every so often.