1. Use a coin, key or nail to twist open the battery cap on top of the ball.
2. If this is your first time using the set, make sure to remove the white tabs.
3. Carefully lift the metal battery arm to release the batteries, then flip the ball to dump them.
4. Replace the batteries with 2x 1620 batteries, both facing up.
5. Close the battery arm, then twist the battery cap back in place.
6. Click the button to turn on the light.