First, attach the Magnetic Pin Back to the Battery.

You can also use a AAA battery pack, its a bit larger but can use any AAA alkaline or rechargeables

Next place the Circuit Playground into the 3D printed enclosure.

Be sure that the battery connector is lined up with the opening on the side.

Slide the battery into the back bracket so that it holds the Circuit Playground into the enclosure.

Place a bit of electrical tape at one or both ends of the battery to help it stay in better.

When you are ready to use the badge, connect the battery.