Service Battery: The battery isn’t functioning normally, and you may or may not notice a change in its behavior or the amount of charge it holds. Take your computer in for service. You can continue to use your battery before it’s checked without harming your computer.
Can I change the battery myself? I have had this message about six months. Thank you
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Here's how to change it out: Battery and Trackpad. Disassembling MacBook Pro 15" Retina 2012-2015
Here's the battery:
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