I have had a lot of success with Anker battery and charger products around my house. Anker is having a sweet one day sale today. Here are my picks. Get Amazon Prime here if you don’t already have it.

[3 Pack] Anker PowerLine USB-C to USB 3.0 Cable (3ft)
Anker PowerCore II 20000, 20100mAh Portable Charger with Dual USB Ports
Anker PowerCore+ 26800 PD with 30W Power Delivery Charger
Anker PowerCore 5000, Ultra-Compact 5000mAh External Battery

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Source: [H]ardOCP – Anker One Day Sale at Amazon