Position the two enclosure parts and carefully join the Raspberry Pi A+ GPIO header with the socket on the 3.5” PiTFT display. Double check to ensure the all pins are goin into the socket properly - Press them firmly together.
Insert four #4-40 3/8 flat Phillips into the bottom enclosure part with the recessed stand offs. Fasten until screw reaches through stand off.
Turn on the Powerboost 500C with the slide switch to test the circuit. The Raspberry Pi A+ should boot.
And thats it! Now we have a portable Raspberry Pi with touch screen. The battery can be recharged using microUSB. The microSD card, USB, HDMI, audio jack and microUSB port are accessible. The device can be tethered to USB power for extended use cases.