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My Mid 2012 MacBook Pro, goes into hibernation immediately after logging in. Battery indicator still shows around 95% charges when it does that. When I plug in and reboot, battery shows 0%.

This does not happen if I just let it stay in the login screen for, say 2 to 3 hours. The battery can stay for about that long which is I can say is the normal for it. At least before this issue arises.

Might this be just calibration issue? Is it fixable without having to be brought to service center?

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Reset to default
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If you've reset the SMC and it's still showing the problem, then you will need to take it in to an Apple Service Centre. The 13-inch 2012 MBP is still supported, as it was sold up to October 2016.

The 15-inch model is considered "Vintage" and Apple no longer provides hardware support. (Though it might be worthwhile taking it in anyway and smiling sweetly: my local Apple Store says they will continue to fix vintage hardware if they still have the parts.)

Batteries are the one part of a laptop that you can expect to fail over time and need replacing. If you can get it replaced, then that's a small price to 'refresh' your laptop and extend its useful life.

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  • Thanks for the link. I did tried resetting the SMC. I tried both with and without disconnecting the battery. I'm not sure what it does or how to tell if it works, though. The charge problem still persist.
    – bluearth
    Commented Jul 8, 2019 at 3:19

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