Placing the battery holder
Battery holders make building creative circuit projects WAY easier. Place your coin cell battery in the battery holder with the positive side of the battery facing up.
Now you can attach copper tape, conductive thread, or anything else that's conductive to the two metal knobs on the left and right side of the battery holder. The knob on the side with the three prongs is the positive side of the battery, and the other side is the negative side. ♦