Circuitmess Sparkly Instructions Manual page 22

The next step is to connect the batteries to the board and
test whether the motors are moving in the right direction.
We'll need a battery holder, two small metal screws, two
small plastic standoffs, and three AA batteries for this.
Acrylic
casing
Battery
holder
Plastic standoffs
AA batteries
Metal screws
To begin, insert the metal screws into the battery holder.