Try amazon smile to donate to charity automatically at no cost to you!
https://smile.amazon.com/dp/B00VWV8LD4/ref=cm_sw_r_cp_apa_fab_Ea8CFbFCKEVEC
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I used a cheap $8 battery bank from Amazon to power the pi and took power straight from the battery to the screen with a 5v to 12v boost converter. I think it was this one.

Try amazon smile to donate to charity automatically at no cost to you!
https://smile.amazon.com/dp/B00VWV8LD4/ref=cm_sw_r_cp_apa_fab_Ea8CFbFCKEVEC
^{I'm a bot and this action was preformed automatically.}