Apple released the MacBook Pro 15" Unibody with a new aluminum upper case machined from a single aluminum block.

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Replaced battery - now getting random shut downs :(

Hi all, I have a late 2011 15" Macbook Pro. I replaced the battery with one purchased from ifixit. The install was straightforward however I'm now getting intermittent random shut downs - the computer will lose all power (screen turns black etc). If I press the power indicator button on the side of the computer it will show no power for about 30 seconds. Then it will show the battery strength and the computer can be restarted. This will happen with any battery strength remaining, but usually around the 30 to 50% range. I have reset the SMC and the PRAM with no improvement. It's not happening very frequently - about once a day or so, but is becoming annoying. When I first installed the battery, I let it fully charge, and then ran it down almost to zero before recharging it? Any help is appreciated - not sure if this is a battery issue and it needs to be replaced?

Thanks!

Answered! View the answer I have this problem too

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Take it in to an ASP and ask them to test it for this issue, I have seen this a couple of times before on this machine, and it wa the logic board:

MacBook Pro Repair Extension Program for Video Issues

https://www.apple.com/support/macbookpro...

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It doesn't sound like you have a bad cell in your battery. ( have had a bad cell in my 2008 MBP, and that always shut down at close to 80% life remaining.

I did have an issue with random cold shutdowns when I replaced my optical drive with an OWC data doubler with a 750 GB HDD. had to go back in several times to get the little ribbon cable between the doubler and the motherboard seated correctly on the motherboard.

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William Robinson will be eternally grateful.
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