Institute of ImaginationRobot LabRobot Lab

Step 5 of 6

Put in the battery and close the flap

Put the battery on its square, + side up. Fold the flap so its copper presses on the battery. Does your LED light? Hold the flap shut with a binder clip or masking tape. Lift it to switch off.

The card from above, twice: first the coin cell battery on its copper square with its plus side up and the flap folding over onto it; then the flap folded down over the battery, held with masking tape, and the LED lit