Оригинальный сообщение: Worlddreamer ,
I have Macbook Air A1370 (MacbookAir4.1, High Sierra) I had to replace an original nearly dead battery with the replacement I bought on eBay. I received A1495 battery instead of A1406 supposed for my Mac (even it was advertised as compatible) When I replaced the battery the system became extremely slow, but as it was in another country it was very hard and costly to return/exchange battery. '''Finally I found a solution.''' You have to delete one plist file from your system. You may find the solution here: google => macbook-pro-running-slow-battery-fix To be able to delete a plist you may have to disable SIP. Saved me a lot of time and money :-) P.S. I also tried to update SMC, but I didn't find a solution for High Sierra as an update mentioned earlier doesn't work on High Sierra and I'm not sure the SMC on my Mac is up to date.