By Applerocks, 21 January, 2019 Forum macOS and Mac Apps when should charge my Mac? should I charge it at 5 percent? Options Log in or register to post comments Comments when should I charge my Mac? Yes you should charge it at 5%. If you want any laptop battery to last you should wait until the charge gets low before plugging it in. If you leave it plugged in all the time it will significantly diminish the charge of the battery. I have learned this lesson the hard way from not allowing my computer to run on battery enough and leaving it plugged in all the time.