Quantity   Component name
1 × Raspberry Pi Zero Desolder the camera connector and Power Micro USB!
1 × Cheap NES Controller One with a NES connector, not a USB one.
1 × MicroSD Card with RetroPie Installed
1 × Adafruit PowerBoost 500 Charger To avoid opening the case to replace the battery
1 × 850 mAH Battery Needs to be physically small, this is the biggest I think I can cram in!
1 × 5mm LED (Bi-Colour) Or RGB if you want to get fancy
1 × 5mm M2 Screw To hold the PowerBoost In Place
4 × M2 Nuts To stack and make a mount for the PowerBoost
1 × 6mm Momentary Pushbutton Low Profile - I sued 5mm
1 × On/Off Switch