Thanks

What about this puppy: https://www.amazon.com/AUKEY-20000mAh-External-Charger-Nintendo/dp/B0759TDR3H/ref=sr_1_4_acs_ac_2?s=wireless&ie=UTF8&qid=1537908743&sr=1-4-acs&keywords=usb+c+battery+pack

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A good power bank.

AUKEY USB C Power Bank, 20000mAh Portable Charger USB C, Slimline Type C Battery Pack with 3 Input & 4 Output Compatible with iPhone Xs/XS Max/ 8/ Plus, Nintendo Switch, Samsung Galaxy Note8, Pixel https://www.amazon.com/dp/B0759TDR3H/ref=cm_sw_r_cp_apa_i_4HihEbAE3QT8W