I used double sided tape to stick the battery and the power converter to the back of the board.

Black wire: GND power converter to GND pin, GND pin to connector

Yellow wire: VOUT to connector

White wire: 6 pin to connector

Red wire: VIN to VBATT

I crimped connector pins onto the ends of each wire then attached the connector.

We needed to add a power converter because the battery supply is 3.7V and the Circuit Playground down converts that to 3.3V so we needed to boost the battery voltage to 5V to power the LED strip.