Replaced battery and macOS still reports No Battery Available(black X)
I have a late 2012 13" Retina MacBook Pro with a "No Battery Available" problem. I just replaced the battery and the issue still persists. I have reset the PRAM, and the SMC several times. I have tried draining capacitors (held power button) while the battery was disconnected as well.
I find it unlikely that the new battery is the issue, what is the next step in diagnosing? I do computer repairs, however I don't have enough information to diagnose problems with the SMC circuit, etc. There is no water damage and nothing appears damaged on visual inspection.
Does anyone have specific information about the SMC circuit, fuses, etc. that I should look at? Thanks!
I added this image after reading Reece's helpful answer. (See my comment below.)
Is this a good question?