Follow the circuit diagram to reference how the components will be connected together. The size of the components and length of wires are not exact - This diagram is meant to be used as a point of reference.
Slide switch is wired to the EN and GND pins on the Powerboost 500C.
The positive pin from the powerboost is wired to GPIO #2 on the 3.5" PiTFT display. Negative pin is wired to GPIO #6.
The male JST from the 2500mAh battery is connected to the JST connector on the Powerboost500C.
The 3.5" PiTFT display connects to the GPIO header on the Raspberry Pi Model A+.