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Gadgets today are quite power grabber, battery usually doesn't last long. The faster the device, the more power it needs. Powerbanks were invented for this situation, power on the go. Charging without the need of charger and outlet. The common powerbanks are single usb port, slow charging speed and low capacity.
As I experienced the same problem, I looked for the requirements I need. Fast charging (Qualcomm Quick Charge 3.0), 2-3 charging ports,...
