Finally got it working, Portable Hifi Player.
Hardware and Software list:
- Aluminium Pi3 Case, with 2.2 Adafruit TFT screen;
- Pi UPS Hat, 1500Mah Battery
- Volumio 2.853
- Adafruit TFT display driver
- Touch Display Plugin
- GPIO Button Plugin
No DAC attached, headphone output. The battery can provide 3 more hours playing.