MacBook Pro suddenly goes off

Coconut is a nice and useful little utility but nothing is perfect. Battery data seems pretty bad to me..with capacity around 60% side issues can be easily expected. Try replicating the same conditions with battery disconnected and see if the Mac still turns off..I expect it won’t. Or just wait for a few days if you can’t run just off magsafe, if it’s a battery issue things will get worse pretty soon.

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@arbaman - While I don't disagree the battery is showing its age, its has not gone beyond what one can expect to get. True it does need to be replaced but that's not the first action needed here.

Re-read the usage: "when i have a lot of application opened goes off" Polliog is just expecting too much from this system given its resources.

Remember if the system was plugged in with the MagSafe you can encounter this type of issue when the systems power needs exceeds what the MagSafe can offer to run your system. At which point the battery will be sucked on to make up the difference! Think how when you have multiple batteries in parallel increases the run time of the device. So the system will shutdown (Sleep) when the power level drops below what the system can run.

Running fewer apps (windows) as well as maximizing RAM and storage will go along way here.

19 giu 2019 da Dan

@danj I'm not implying at all your analysis is not correct, just trying to bring up a possible alternative explanation to let the OP see if any may solve the issue. Coconut is a nice App but far from perfect..in this very moment I'm writing from a MBA on my laptop, room temperature close to 25C, Coconut says the battery temperature is 21,5C. Mac Os tells me the battery condition is "normal", Coconut says it's "good". What do you think of a battery at 7.3V..good, normal ? To me it seems a bit borderline..that's the reason why I take those readings not so seriously..batteries seem to be strange beasts :)

19 giu 2019 da arbaman

I think you're hitting different issues within the methods the sensors are read.

If you go to the local five and dime store looking at all of the digital thermometers they have you'll note some will be off! So why is that? The making of the device may have some variability but even if you had very accurate devices the point in time to read the value can be at different points in the polling of the sensor.

Now looking at our Mac's this gets into the polling of the OS and the app which is not treated the same! So the OS value will be more accurate as its polling the sensors natively via SMC. Unlike CoconutBattery which has to wait until the value is available during its poll of the OS's storage space of the value. Remember CoconutBattery is not aggressive in its polling. So it will often be different!

We also have other tools which you can use which you can validate things give TG Pro a try. Depending on the system you might note you have three sensor values! Two sensors and a max setting. In my 2012 15" MacBook Pro system I have 35 & 36º C in TG Pro and in CoconutBattery I'm getting 36.9 º C So CoconutBattery is within reason.

19 giu 2019 da Dan

@danj @arbaman for the moment i will test with some different condition

for now I have recalibrated the battery and i don't have problems

19 giu 2019 da Polliog

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@arbaman - While I don't disagree the battery is showing its age, its has not gone beyond what one can expect to get. True it does need to be replaced but that's not the first action needed here.

Re-read the usage: "when i have a lot of application opened goes off" Polliog is just expecting too much from this system given its resources.

Remember if the system was plugged in with the MagSafe you can encounter this type of issue when the systems power needs exceeds what the MagSafe can offer to run your system. At which point the battery will be sucked on to make up the difference! Think how when you have multiple batteries in parallel increases the run time of the device. So the system will shutdown (Sleep) when the power level drops below what the system can run.

Running fewer apps (windows) as well as maximizing RAM and storage will go along way here. — Dan
@danj I'm not implying at all your analysis is not correct, just trying to bring up a possible alternative explanation to let the OP see if any may solve the issue. Coconut is a nice App but far from perfect..in this very moment I'm writing from a MBA on my laptop, room temperature close to 25C, Coconut says the battery temperature is 21,5C. Mac Os tells me the battery condition is "normal", Coconut says it's "good". What do you think of a battery at 7.3V..good, normal ? To me it seems a bit borderline..that's the reason why I take those readings not so seriously..batteries seem to be strange beasts :) — arbaman
I think you're hitting different issues within the methods the sensors are read.

If you go to the local five and dime store looking at all of the digital thermometers they have you'll note some will be off! So why is that? The making of the device may have some variability but even if you had very accurate devices the point in time to read the value can be at different points in the polling of the sensor.

Now looking at our Mac's this gets into the polling of the OS and the app which is not treated the same! So the OS value will be more accurate as its polling the sensors natively via SMC. Unlike CoconutBattery which has to wait until the value is available during its poll of the OS's storage space of the value. Remember CoconutBattery is not aggressive in its polling. So it will often be different!

We also have other tools which you can use which you can validate things give TG Pro a try. Depending on the system you might note you have three sensor values! Two sensors and a max setting. In my 2012 15" MacBook Pro system I have 35 & 36º C in TG Pro and in CoconutBattery I'm getting 36.9 º C So CoconutBattery is within reason. — Dan
@danj @arbaman for the moment i will test with some different condition

for now I have recalibrated the battery and i don't have problems — Polliog

Dan @danj Rep: 478,8k Self employed contract worker 35 329 970 · Answer 1 · 2019-06-18T11:05:18-07:00

Check the MagSafe connection on both the cable and the system make sure they are clean and shiny.

Do another snapshot with the MagSafe charger connected (it should be Amber) and post it here for us to see,

Let the system fully charge.

OK, I don’t see anything wrong here. While your battery is showing its age I don’t think that’s your issue!

Remember your system is not a desktop so you do need to manage how many apps running when its on battery. Even when you have the system plugged in your battery will be accessed to make up the needed power when you have too heavy a power draw.

Things you might want to look at is the amount of RAM your system has. If you only have 4 GB I would upgrade one of the SO-DIMM’s to a 4 GB unit so you can max out your system to 6.0 GB.

You also should look at your drives free space both HDD’s & SSD’s need free space to work effectively. The OS leverages the drive for virtual RAM so when you have a limited amount of RAM like you do here, the drive will be more heavy used. With HDD’s thats a lot of power being used. In the case of SSD’s they end up needing to do wear leveling which will likewise use more power.

So Max out your RAM and if you don’t have much free space free up as much as you can. For HDD’s you should get a defragmentation app to clean up the drive. For SSD’s you really need to have 1/4 of the drive free.

for the moment the free space seems ok I have about 450gb free on an new HDD

but anyway an upgrade for the RAM isn't a bad idea — Polliog

MacBook Pro 15" Unibody Late 2008 & Early 2009

MacBook Pro suddenly goes off

Update (06/18/2019)

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Update (06/18/2019)

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