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Question: MBP Running slow when its on batteries .. working fine when plugged to the charger ?!

Hi there !
I noticed that my MBP is running very slow when it's on batteries.. but when plugged to charger it works fine..

Is the battery drained already ? I purchased it OCT 2011 but has been using it lightly for almost 5 months ..

P.s : I cleaned it up coz I thought its a space or piled files issues but it didn't work




Thank u in advance 🙂

MacBook Pro, Mac OS X (10.7)

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Oct 6, 2013 7:43 AM in response to monicasood In response to monicasood

Monica, I reformatted the MacBook I was having problems with and it didn't make any difference.


Try it though, do a Time Machine backup first, format your disk and install a fresh system from the disks that came with your MacBook. Then restore from your Time Machine backup. If you still have the problem, try following my previous instructions exactly, step by step.


If that still doesn't work try upgrading to Mountain Lion via the App Store. As far as I know this only happens with Snow Leopard.

Oct 6, 2013 7:43 AM

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Oct 6, 2013 9:02 AM in response to monicasood In response to monicasood

Monica, I have been to the Genius Bar in Stanford. All tests were done there and no problem found. When they told me that they would reload the OS X I took my MBP back home to perform another back-up (to be safe) and then proceeded to download the OS X from the Apple Server myself incl. reformatting the disk - which can take many hours. With just the newly installed OSX 10.7.3 running the problem re-surfaced with first just 50 to 60% System CPU and soon again up to 80% - our original problem. I then proceeded to load all user files from the back-up and of course the problem with sluggish performance while running on a healthy, fully charged battery continued - until I found and took out the kext file for my MBP type. Since then I am ok as new, monitored temperature und fan speed and for the last 2 months since the removal of the small file it runs fine.

Oct 6, 2013 9:02 AM

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Feb 9, 2014 2:24 PM in response to John Galt In response to John Galt

GENIUS!!!!!!!! THIS WORKED FOR ME !!!!!


😁🙂🙂🙂🙂🙂🙂



Try this at your own risk - It Worked for me after a complete system reload which didn't make any difference.


I will take no responsibility for any damage or loss caused to you or your property. Do it of your own free will and at your own risk.


I did this on a MacBook Pro Early 2011 - 2.7 GHz Intel Core i17

System Version 10.6.8 Snow Leopard


Running well on mains power but dramatically slowing down when running on battery power


First try this to see if you get the same result I got


Quit all programs

With the mains connected

Open Activity Monitor and click on CPU in the bottom half of the window

Check the CPU Usage graph - It will probably be minimal - Under 1%

Now disconnect the mains and watch the graph shoot up and CPU activity around 80%


Here's what I did...


Again - I will take no responsibility for any damage or loss caused to you or your property. Do it of your own free will and at your own risk.


Firstly, you’re going to need the model identifier of your Mac,

go to the Apple in the menu bar and select "About this Mac"

When the About this Mac pane appears click on "More info…"


Select Hardware in the left panel

In the right panel make a note of the Model Identifier e.g. "MacBookPro8,1"


Now open a finder window and click on Macintosh HD

Click on system >Library > Extentions

Find the kext file called IOPlatformPluginFamily.kext

Right click it and Show Package Contents

Click on contents

Click on Resources

Click on PlugIns

Right Click on ACPI_SMC_PlatformPlugin.kext

Right click it and Show Package Contents

Click on contents

Click on Resources

Find the the plist file that corresponds to your Model Identifier e.g. "MacBookPro8,1.plist"

Move it to the trash and delete it

Restart and everything should now be fine.

Feb 9, 2014 2:24 PM

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Feb 25, 2014 6:22 AM in response to tony_stead In response to tony_stead

Thanks a lot Tony, I had the same problem and now it seems fixed!


The slowness problem occurred to my MBP after a milk leakage (!!) that blocked for a week the mac... It was died, and to restore it I put it opened in a box with 1 kg of rice, and after a week it started again to work properly, except for the slowiness when unplugged from the main. Now I deleted the plist file "MacBookPro7,1.plist" following your suggestion, and it works fine... thanks again!!!!


My doubt is: what could happen now, without that system file? I am taking some risks (for example: some sensors are not checking the temperature of the battery, and it is no more under control)?


Do you know what exactly should that file do?


I looked for this info on the web, but without any result...

Thanks in advance for your reply!

Feb 25, 2014 6:22 AM

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Feb 26, 2014 12:19 AM in response to cordialmente In response to cordialmente

see i already ried this a few months ago, in june of 2013, i had water spill on mac, which burned few components and i got them repaired by a service centre(not apple). it costed me around 5k INR. but after that repair my mac was slow without charger n i saw this thread n it worked fine except sometimes it used to shut off over heating if i played some heavy game or used photoshop n agter effects for a long long time. but it would restart again but by december one day my mac completely shut off...then i took it to a mac service centre..there they checked it n said the logic board stopped working n i had to get a new one for 35K INR. so i think u better get ur mac to service at a service centre recognized by apple for any damages and extend warranty for atleast 1 year just in case **** happens.

Feb 26, 2014 12:19 AM

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Dec 11, 2014 10:22 AM in response to tony_stead In response to tony_stead

Seriously, thank you. I took my computer in to Apple twice and called in to Apple support with no luck. They wanted to erase my hard drive and do a clean install of Yosemite. I chose not to let them because I have some good software, once deleted, I can't replace for free, like Office and Photoshop.

After reading your post and seeing all of the thank you replies to your post, I knew there was a chance.

Sure enough, after deleting the computer identifier in my system library, my computer works great!

Before deleting the file, when I unplugged my laptop, my CPU percentage would go up from 3% to 35% and the trackpad would skip around and become unusable. The computer acted like it was running on half power.

After deleting the identifier, my CPU usage went down to normal and my computer works as expected. I'm using it on battery right now.

Thank you very much.

Dec 11, 2014 10:22 AM

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Question: MBP Running slow when its on batteries .. working fine when plugged to the charger ?!