Potentially shorted battery circuit, please help.

[metaColin]

Can you describe how you plugged in the battery?

I attached a photo showing the battery plugged in.

(I added the pins for a second battery pack, but I haven't tried 2 batteries yet.)

But since I found the bulge on the circuit my theory is I must've arced the red & black pins with my screwdriver or pliers when the battery was plugged in.