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My old battery would cause the Mac to shut down at about 18%. The new battery says it will take 5+ hours to charge and then once it’s charged, it is dead in about 30 minutes. I tried the battery calibration procedure and when I was trying to run the battery dead, it held at 6% for over an hour!!! Any ideas?
Lets get a better idea on whats happening here. Install this gem of an App: CoconutBattery. Then take a screen shot of the application window so we can see whats up. You’ll want to take two snaps one with the MagSafe connected and the other when its on battery alone. Adding images to an existing question Update (07/14/2018) From the looks of it the discharge & charge levels look good! Lets change the focus here onto the MagSafe charger to see if thats the issue. Review this Apple T/N make sure you have the correct charger and the contacts on both the cord and system are clean and in good shape (as well as the cord its self) Apple Portables: Troubleshooting MagSafe adapters
