Macbook Air slow on Battery

Hello,

I bought a used MacBook Air (7,2) 13" 2015 from eBay.

Everything is fine … but when not plugged into power after about 1-10min the CPU-Load went crazy. "Kernel-Task" uses all the CPU and the system is extremely slow. When i plug in the power cable it take a few moments and everything works fine again.

I tried resetting SMC + PRAM and reinstalled the latest version of Mojave.

Apple Hardwaretest says everything is fine.

The seller replaced the SSD (screenshot). May this be the Problem?

The Battery is in good condition. But i didn't know if this is the original one.

Any help how to solve the Issue?

Thanks in advance!

[Image Edited by Moderator to Remove Serial Number]

MacBook Air 13", macOS 10.14

Posted on Jun 15, 2019 6:45 AM

Top-ranking reply

HWTech

Level 9

68,792 points

Posted on Jun 15, 2019 5:53 PM

Did you boot into Internet Recovery Mode using Command + Option + R to erase the physical drive (not the "Macintosh HD" volume) and install a fresh clean copy of macOS? Never trust any software setups from any unknown third parties (sometimes not even from people you know).

I don't know which Samsung SSDs are compatible, but it is definitely using a third party adapter since Apple uses a proprietary interface which is different from most M.2 SSDs on the market.

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Macbook Air slow on Battery

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