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The Power Bank is designed for the people who work in the fields or work outside for a long time, which has a aluminum alloy shell and is 7.8 inches long, 21 inches wide, 2.75 inches tall. You can select any of 1 ~ 29 section 18650 types of lithium batteries because any sections lithium battery can work normally, that is if one section lithium battery capacity is 4800 mAH, then the maximum capacity will be 139200mAH.With support of large current charging DC interface ,the ordinary mini usb port, and four usb output, it will support 5v4a output current.