MacBook turns off when charger is disconnected

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If the battery, charger and the logic board are not in good shape resetting is the least important!

@danj My problem is leave my system plugged in most of the time as you told. First I realize mac shut down while battery is % 90-%100. Then I try to solve problem as you explain. Leave battery, try to discharge on recovery mode, smc and pram reset many many times. I reach % 25 minimum and charge to % 100. But when I unplug, shut down while battery at % 92 . Additionally "check the battery" status has shown up after I leave battery.

@Mustafa SAYIN - Your battery needs replacing! Batteries are tricky, some will last a long time others will fail prematurely as in this case.

@danj Thanks very much. "Check the battery" status has gone:) I will cycle the battery somehow. Bu how I don't know but I will:)

@Mustafa SAYIN - MacBook Pro 13" Unibody Mid 2012 Battery Replacement

It's certainly not the battery, that's for sure. It's a NewerTech battery, still with 103% health, and all tests show it's in good condition. The fact that it shows up in TechTool and Coconut Battery is a good indication that it isn't disconnected. I'll pry open the computer now and see if that'll teach me something, but experience tells me I'll just blankly stare at its insides and wonder what I'm looking at. And as we all know, the difference between me and a PC repair shop is mainly that they charge me for doing the same thing I do; staring blankly at it. I appreciate your answer, and I'll have a look inside to see if something is looking awry.

What kind of a self-help forum suggests taking it into a PC shop?

I had the same issue in two different MacBook pros at home. Turns out something went wrong with the charger!! Worked fine for awhile on either one. Then one day my pro wouldn’t turn on even though I knew it was charged. Researched and did the reset. Then the same thing happened with the other pro. Our other charger doesn’t cause this to happen. Ended up being a glitch with the charger causing the problem.

Sorry, your SMC reset instructions (with the buttons) are incorrect.

The battery, while replaceable, is not considered by Apple to be user replaceable, that is why there is a secret screwdriver screw, the three-fin thing, so you have to follow the instructions for non-replaceable batteries. I know, it is really confusing and dumb.

Here are the proper instructions: How to reset the System Management Controller (SMC) on your Mac Notice it says to UNPLUG the adapter, and HOLD THE BUTTONS FOR 10 SECONDS.

But anyway, your instructions for resetting the SMC by unhooking the battery and pressing the power button... that might work. Or maybe press it longer, like the chosen answer for this question suggests.

I will ask the same question!!!

For me was very hard, adding USB devices and trying to open on Safe Mode, and half close the screen... a nightmare

The Chicken and the Egg problem ;-}

The premise here is once SMC is reset it does not have either a high or low threshold set. So once done you need to completely drain the battery until SMC see's the low threshold voltage wise has been hit it will then shutdown. Now recharging the battery and then repeating will set the high point. That should do it!

Now the but! The voltage comparator logic on the logic board needs to be working properly. If SMC is prematurely shutting down after a reset there is a problem on the logic board. Often corrosion has built up on the one or more of the components that set the value or the chip its self is defective.

How did you solve the problem? I appreciate your help!

@rahel - You likely needed a new battery or the logic board needs repairs.

My MacBook Air shutdown when connected, I bought new battery, I clean both charging port but still it can't charge

I'm really confused, I checked the hardware no issues I also did update, reset the SMC but still. What I did is removed my batter to same MacBook air 13” to a friend own and charge and put it back, then it turns on but immediately I put the charge to the charging port then it's off! Please help or advice!

`It may be that you have to use CNET's solution AND replace the Magsafe adapter.

I've had zero problems with this issue since posting that message and resolving it with CNET's solution, UNTIL I was away this past weekend and threw the old Magsafe in my bag and left the newer one I usually use. The issue returned (MacBook Pro goes dead when Magsafe adapter removed and needs to be rebooted).

But when I got back home and used the newer Magsafe adapter I usually use, no more issue, and didn't have to do the CNET solution all over again.

I DID have to do the CNET solution with the newer Magsafe adapter initially and have not had a problem since, so the solution (for me) was:

1. Replace the Magsafe adapter.

2. Use CNET's solution as outlined above.

Running fine.

Thanks...will try a new adapter. Do you know why it would make a difference, although doesn't matter as long as it works. With the one I'm using, the icon does show 100% with no warning after the CNET solution...until I unplug. It did take overnight to charge the battery the first time which seems long..

No idea why. I'm just sharing what worked with me. I assume the adapter is defective and that affected how the Mac read the power situation until it got a new adapter and the CNET solution. I still have had no issues at all since it reappearing the same day I used the old adapter then went back to the new adapter, but it was definitely a combination f both that fixed it.

I tried a new adapter at an Apple store and it didn't help. When I plug the adapter back in, the computer automatically starts up with chime, without pressing the power button. It's not just going to sleep.

When I replaced the battery, I didn't take off the plastic film that was covering each of the 3 cells/rectangles because it seemed attached at the bottom in one corner. Could this be a problem? There were no instructions about the film. Thanks

All I can share is my experience. I'd plug in the new adapter, then do the CNET trick. That fixed mine. Don't know about the battery stuff.

The problem Is the batery...the clok does not work if the MAG safe is disconected.

Did you solve "how you did it?" . Mine not charging after big sur 11.3.1 showing 1% but in windows 10 it shows 74% but not charging .

Then you either have a bad battery or the MgSafe charger and the charging logic inside the system is bad.

Let’s get a better view of things, install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question

I don't do DM's as most of the time we are in different time zones. I bet you're about to go to bed while I'm just getting up ;-}

Let’s get a better view of things, install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question Edit your post here with the output.

Then I can help you.