mophie Powerstation Mini 3K (3,000 mAh) - Black (Certified Refurbished) Connect your smartphone or virtually any USB device for an additional charge using your own cable or the included micro USB cable. Enables pass-through charging while connected to a power source. Your device charges first, and then the powerstation battery recharges itself. 2.1A output and smart adaptive charging technology communicate with your connected device and always deliver the fastest, most efficient charging speeds possible. High-performance power concealed inside a sophisticated and sleek design make this portable USB battery charger the perfect accessory for any mobile lifestyle.