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I recently replaced the battery on my MacBook Pro and for some reason the charger light is green as if the battery is fully charged, but the screen shows it’s at 1%. It turns off if not plugged in. I don’t understand why the battery is not charging.

First of all, let’s do some testing to see if the battery is OK or not. Go ahead and complete that guide below. Make sure to post an image of the coconutBattery window to your existing question when you are done! There is a guide for Adding Images to an Existing Question there too. How to Test a Mac Laptop Battery