Quantity   Component name
1 × Polymer Lithium Ion Battery (LiPo) 3.7V 1100mAh https://core-electronics.com.au/polymer-lithium-ion-battery-1000mah-38458.html
1 × Adafruit Micro Lipo w/MicroUSB Jack https://core-electronics.com.au/adafruit-micro-lipo-w-microusb-jack-usb-liion-lipoly-charger-v1.html
1 × 3D Printed Enclosure (2 Parts) https://github.com/senwerks/lipo-battery-for-original-gameboy/
1 × 1mm brass wire For bending/gluing on as battery terminals
1 × 22AWG wire Preferably silicon coated for tight bends