Fine to keep macbook on power for unlimited time? I just got a used Macbook Pro (retina) 2012 running El Capitan. I am keeping it charged and on all the time. Is there any harmful effect from doing so on the battery in the long term?
Technically no, there is no damage done to it. But it is still smart to let it unplug and fully drain the power to keep it in tip-top shape.