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Need such a thing for an emergency launchcar engine when the car battery is discharged. And it can be discharged during a long idle time of the car (5-8 days), due to the included radio or headlights, etc.
And if you find yourself in a situation like this PowerBank can be connected to the battery, then quickly and without problems return the car to "life". It can also be used to recharge gadgets, as it has a USB output.