CPU overload after installing new battery.
I have a MacBook Pro A1286 Early 2011, i7 2GHz 8GB, running MacOS High Sierra.
I have recently restored the MacBook and installed a new battery (after market) when installing the new battery and after entering the OS. The MacBook after around 5-6 mins of use becomes very slow. As can be seen on activity monitor CPU /System usage is around 85-95%.
If I disconnect the battery, CPU / system usage returns to normal at around 8-20%.
My first thought was a faulty battery, I have since purchased another after market battery and I am experiencing the same issue. I have also tried using a different DC board to see if that was the issue.
I have also reset the SMC to see if the power management controller was confused but this does not seem to have altered the situation. Has anyone else come across this issue? Or have a solution.
Thanks in advance.
I’ve added screen shots of apple diagnostics with and without the battery installed.
This is the second of two new batteries I have installed, so I’m pretty sure I can’t be unlucky enough to have 2 dud ones…surely.
With and without new battery installed, running diagnostic.