This!!! This should be highlighted in the guide!!
I lined my battery up wrong and really had to torque the cables to get the connectors to seat. Fortunately they did.
Just went through the replacement and the battery "plug" (step 5) on my replacement battery was slightly misaligned relative to the metal plate used to screw it onto the board. The plastic and "gold" "plug" was slightly askew on the metal plate, which meant that when the plug was inserted, the screw holes (step 4) were poorly aligned.
I managed to pull everything back into line using the screws, but the QC on these replacement batteries is a bit suspect.