The DJI USB Charger allows mobile devices such as smartphones or tablets to be recharged using a DJI Intelligent Battery. If the battery level of your mobile device runs low when flying outdoors, you can connect a DJI USB charger to an Intelligent Battery to recharge. Note: If using a DJI Intelligent Battery as the power supply, a Battery (10 PIN-A or 2 PIN) to DC Power Cable is required and can be purchased separately from the official DJI Online Store.