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Processeur quad-core Intel Core i7 à 2,2 GHz (Turbo Boost jusqu'à 3,4 GHz), 2,5 GHz (Turbo Boost jusqu'à 3,7 GHz), ou 2,8 GHz (Turbo Boost jusqu'à 4,0 GHz) avec 6Mo de cache L3 partagé.

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Weird behavior on login - unexpected shut down


I have a really weird behavior with my MacBook Pro Mid 2015 with dedicated GPU.

If I power it on WITH the power adapter plugged in after login everything is fine.


If I power it on WITHOUT power adapter, after the login process it is shutting down after 1 second showing the desktop.

It’s really weird and annoying. Fortunately I also have a MacBook Pro 2015 without dedicated GPU, but that one isn’t acting this way. I think that the problem is caused by the dedicated GPU, a friend of mine with the same MacBook is also experiencing the same behavior.

Please help! :-)

Update (11/17/2022)

Here is the Coconut Battery info

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Répondre à cette question J'ai le même problème

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Sounds like your battery needs replacing. Install this gem CoconutBattery post a snapshot here for us the see.


I have already verified it with CoconutBattery. No problem.


@Victor Ioan Cernea - Can you post the image please.


Here is the Coconut Battery info [image|2788053]


What Mac OS are you running?


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Well we can only guess, but it would be an easy fix if it’s just because of at that login moment some process may be initializing something pretty power hungry and either your battery can’t keep up or you indeed need to reset both SMC and PRAM/NVRAM. Or both.

Could also be that your battery is low quality or a defective one - but let’s just put it aside for the moment.

To reset SMC you do not need to disconnect either a battery or MagSafe cable - just do as Apple recommends:

  1. Shut down your Mac.
  2. On your built-in keyboard, press and hold all of the following keys. Your Mac might turn on.
    • Control  on the left side of your keyboard
    • Option (Alt)  on the left side of your keyboard
    • Shift  on the right side of your keyboard
  3. Keep holding all three keys for 7 seconds, then press and hold the power button as well. If your Mac is on, it will turn off as you hold the keys.


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Right after that just to be on the safe side I always reset PRAM/NVRAM - just press and hold Command + Option + P + R immediately after you press power button to turn on your Mac.

Here’s an article on that too on Apple Support

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I think it’s a trickier problem. Here are the premises:

1. Battery is fine, if I boot it up with the power adapter I can use it 4-5 hours, exporting iMovie, Photoshop, 4k YouTube, no problem.

2. If I boot it up in Startup Manager I can even open Safari and works fine without any problem

3. The only case when it shuts off is at the login process.

4. I already done SMC and PRAM reset, reinstalled Monterey, deconnected and reconnected the battery, nothing works.

Maybe is a specific problem for MacBook Pro 2015 with dedicated GPU.

I don’t know


If you have a chance - try a different battery. If not - there must be something more complex


I verified the shutdown cause. It is 0 which is power disconnect.


Is there any chance that a data line of the battery connection (or the entire connector) is not behaving well or may be damaged/broken? This video actually gave me this idea:


@alexanderre - While the vid is on an iPad, it’s very similar to the MacBooks battery logic. Which is where I was focused on in my answer. Here it’s the One-Wire comm link to SMC which manages the power and which is the power source. There are also a set of MOSFETs that do the switching based on what SMC and the power switch demands.


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Well, You are mostly a cord user! I can tell as the number of cycles you’ve run though is extremely low, yet age of the battery is quite old!

One of the issues Lithium Ion batteries face is age as the chemistry only lasts at best six years if it’s getting trickle charge with very few cycles which is the case here. Yes, CoconutBattery is implying your battery still has a bit of life in it, sometimes we can’t always depend on the tools we have to tell us the correct info.

So the Bottomline here is you are in need of a fresh battery, sorry.

Here’s the needed part MacBook Pro 15" Retina (Mid 2015) Battery and here’s the guide Remplacement de la batterie du MacBook Pro 15"Retina mi-2015

Don’t feel bad I just did one of my 2015 15” MacBook Pro’s the other month, it’s now on its third battery. And it’s reaction was similar to yours. I was processing a sizable photo in Photoshop when it stopped working in the hills of Vermont. Rebooted check things out couldn’t find any issues but as the system had been sitting a few months I had a feeling the battery was not holding power and as soon as I replaced the battery it was all good!

Image MacBook Pro 15" Retina (Mid 2015) Battery


MacBook Pro 15" Retina (Mid 2015) Battery


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I understand, the only problem is that my battery was changed in May. I don’t know why the date hasn’t been changed, but from the number of cycles you can see this


@Victor Ioan Cernea - Then you need to force a hard SMC reset, if that fails then this battery has a problem.

To do a forced reset, disconnect the battery and the MagSafe charger. Press and hold the power button for a good 15 secs. Then plug in the MagSafe charger, boot up your system and check CoconutBattery it will likely fail. Now do a proper shut down, then reconnect the battery and check things again does the batteries age now correct? If not you’ll need to get a fresh battery.


@danj I cannot power up with the battery detached :-( when pressing the power button the display shows an empty battery but doesn’t power on


@Victor Ioan Cernea - That was expected as I explained. Now what does CoconutBattery show after you’ve put the battery back in? Any change in the batteries age.


@danj the only thing I doesn’t understand is that, why this is happening only on login. If I wait until desktop appears with the power adapter, I can detach it and use my MacBook 4-5 hours without any problem. So the only problem is that I need to wait until it boots up with the power adapter, after that I can use it from the battery


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Victor Ioan Cernea sera éternellement reconnaissant.
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