My plastic cards were hitting a black trackpad backing. I thought this was the adhesive not coming off. I also didn’t want to harm the battery and didn’t bring the card up enough.
I found out by going through one of the side batteries, but could have just raised the tip of the card very slightly.
RECOMMENDATION: The battery connector and associated screw are critical when considering battery alignment. Also don’t forget the left and right speaker assemblies when aligning the two small outer cells. I didn’t consider these and had issues.
Also, keep the transparent top film on the battery to keep the cells aligned with respect to each other, and always support all the cells if handling upside down.