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I have a Macbook Pro 13 2017 A1706 EMC 3163 The original battery was only lasting about an hour so ordered a new battery. I followed the iFixit guide to installing a new battery. Initially it was working fine and was showing as good health in Cocnut battery. It got to about 20 % charge. I decided to remove the battery as I had not glued it into place as yet. I was about to glude it into place but tried to re-connect and turn it on. Now it is saying Battery is not charging and how can it change from 20% to 0% and now it is saying battery health is poor?
Hi Paul, Have you calibrated the battery? The software learns and keeps track of the battery’s charge to take what is essentially its best guess at how much charge it has left. When you change out the battery, it’s then working off of old data that’s wrong for the new battery. The calibration procedure allows the computer to learn the charge curve of the new battery to correctly report the amount of charge it has. So don’t pay any attention to the reported battery percentage until you’ve run a full calibration, as it will almost certainly be wrong. Here’s a guide to the procedure. Battery Calibration - iFixit Support Closeup of the battery connector.
