I followed the guide to replace the new battery. However, when I tried to turn it on to start the calibration process. It just says 62% charged even when plugged in for a while. Nothing moves up or down. Then when I remove the charging cable, the Mac automatically turns off. I have to leave the charging cable connected so it can work.
Already have tried restarting, unplugging the battery connector, holding the power button and plugging it back. Not sure what else to do here?