After installing an iFixit replacement battery a few months back (that did not work), I was sent another replacement battery from iFixit (much appreciated). As I had just done this process recently, I was pretty familiar with the steps, and followed them carefully.
Now with the new replacement in, it will only power up when plugged in, and not every time. I can occasionally get it to power up, and when I run the CocoaBattery utility, it shows NaN for the battery label and
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0mAh for current charge / design capacity. Sounds, touch bar, USB-C ports all seem to be working. I opened the case up and re-checked all of the connections to the mother board, and re-checked the key battery connections to make sure they are all properly seated. Any thoughts?