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Speed ​​up your MacBook with exhausted battery

For about a year, my battery MacBook Air is completely exhausted. Without being connected to the power supply, I have an autonomy of about 10-15 minutes. In correspondence with the problems of the battery, I have also noticed an evident decrease of the performances of the operating system. I thought it was normal, considering that the MacBook Air of 2011. The strange thing for that a 2009 iMac, on which I mounted a new SSD, faster than my Mac of 2011. So I started looking for a method to speed up MacBook with exhausted battery.

By formatting the Mac and performing a series of recommended resets on the Apple support pages, the situation did not improve. I made a more in-depth evaluation of what the problem might be, until I came across a discussion on a foreign forum where another user found the exact same problem. I went to the bottom of the matter and discovered that if the battery is disconnected from the MacBook, whether it is Pro or Air, or the battery is completely exhausted, the processor slows down and starts working at about half of its real capacity. Not clear the reason, but surely a sort of protection that has included Apple within its operating system.

Considering that the battery of my 2011 MacBook Air completely depleted, the problem of slowing down therefore leads back to this circumstance. Fortunately, I found a procedure to solve the problem. If you also encounter the same problem, below you will see how speed up MacBook with exhausted battery.

How to speed up your MacBook with exhausted battery

The procedure to perform is very simple. It consists in deleting a system file that performs the function to check the battery status. I did this on my MacBook Air and the processor returned to normal speed. Here's how to proceed speed up MacBook with exhausted battery:

  • First you have to understand what the code name of your Mac is. To do this, click on the apple-shaped icon at the top right and select Information on this Mac.
  • In the window that opens, click on System report.
  • A page will open with a summary of your Mac's features. On the left side of the page, look for the item Model identifier and marks the model of your MacBook somewhere. In my case the indication to be marked MacBookAir4,2.

speed up MacBook with exhausted battery

  • Now open the Finder. In the top bar select Go -> Computer.
  • You open Macintosh HD.
  • Go to System -> library -> Extensions.
  • Search for the file called IOPlatformPluginFamily.kext.
  • Right click on this file and select Show package content.
  • Now open the folders Contents -> Plugins.
  • Right click on the file ACPI_SMC_PlatformPlugin.kext and select Show package content.
  • Open the folders Contents -> Resources.
  • Search for the file with the extension .plist which has the same name as theModel identifier that you searched for at the beginning of the guide. In my case the file has the wording MacBookAir4_2.plist.
  • Right click on the file in question and select Move to the Trash. When prompted, enter your Mac password to confirm the operation.

At this point you just have to restart your MacBook. From the first reboot you will notice a greater speed and reactivity of your Mac.


As you could see, speed up MacBook with exhausted battery a very simple operation. in fact, it is sufficient to delete a system file to give new life to your computer. To solve the problem you might even think about buying and replacing the battery. In this case it is not necessary to delete the file in question and everything will work as before.

If you encounter problems, you can ask for support by writing a comment at the end of this article.