Quantity   Component name
1 × Adafruit Circuit Playground Express https://www.adafruit.com/product/3333
1 × PCB https://oshpark.com/shared_projects/hAyWvVy2
1 × solder, flux, acetone, rubber bands, etc.
1 × 7-pin SMD SPDT switch MK12C02
1 × 3.7V 1S AAA LiPo battery at least 500mAh
1 × AAA battery holder
1 × 9cm barrette
12 × M3 nuts and bolts brass ones look the best
1 × MCP73831 Charge controller
1 × 0603 SMD LED any color you like
2 × 2kΩ 0603 resistor