Chosen Solution
I just installed a new battery that I ordered from iFixit, everything went well during installation. After installing the battery I went through the process of calibrating it. First I left it charging over night. the next day I started my MacBook Pro and I depleted it with normal use, during this I checked my battery health and it said 102% so I thought that’s great! at around 10% it suddenly turned off. I left it off for more than 5 hours. after that I plugged the charger in and turned on my MacBook Pro again, I checked the battery health and it said 88%, so I thought that was strange. I charged it over night again and when I checked in the morning it said 91% and that’s what it’s at right now. Can anybody tell me if this is normal? Should I ask for a replacement?
It does take awhile for the SMC to settle in so I would wait. Remember you have a warranty on the battery for a full year!
