Chosen Solution

Hello After replacing the battery, the laptop’s charge was under 20, the speed dropped Now, when the laptop reaches 60%, it turns off What is the problem? Update (05/11/2018) Related topics : Laptop fan work forever :(

Changes made: Add Samsung SSD 250 Remove 2x2G ram and add 1x8G ram DDR3 1600 Remove DVD/RW and add old hdd with using caddy Change Battery

I would change everything back to the way it was before, Then slowly add parts back until the issue happens again. Where did you buy these parts from and are they all mac compatible?