The Power Bank Adapter from DJI allows you to connect the Mavic Charging Hub to the Mavic Battery charger.
The DJI Mavic Battery to Power Bank Adaptor is a very convenient accessory when in the field that is designed to provide power from any of your DJI Mavic Pro Intelligent Flight Batteries to any electronics that are charged by USB. This may include mobile devices such as smartphones or tablets. When you are a day long shoot it is practically guaranteed that your iPhone, iPad, or whatever device you are using with the DJI GO App will run out of battery. Thanks to the DJI Mavic Battery to Power Bank Adaptor you can keep those devices charged throughout the day.