Battery banks sure are helpful in a pinch. If your phone is about to die, you can refill it to 100% in less than 2 hours with the Ugreen Nexode Power Bank 12000mAh 100W. The question is how big and heavy are you willing to go for a sturdy battery bank?
Source : Ugreen Nexode Power Bank 12000mAh Review: A Bulky But Fast Way to Stay Charged