Chosen Solution

I just recently replaced my MacBook Pro battery at the beginning of August with an iFixit battery. I don’t know what happened but after initially replacing it, Coconut Battery said its max capacity was 98%. Now, it’s been less than a month, and it says the max capacity is only at 85.1%? Was I given a faulty battery? How do I fix this? I know I calibrated the new battery correctly when it was first installed.

Here’s the how and why of Battery Calibration: https://help.ifixit.com/article/265-batt