Well I used Adafruit’s PowerBoost 500 + Charger.
https://learn.adafruit.com/adafruit-powerboost-500-plus-charger
As far as how long the battery last, I dont really know. I just finished the project today and have yet to fully charge the battery and try it out. I am powering the hdmi screen, controller, audio amplifier and a fan all from the pi so all that will eat away my charge faster. I’ll charge it over night and try it out tomorrow to let you know. ^_^
