When the remote controller is out of power, the in-flight vehicle will enter "Lost" mode.

There are two mechanisms you can choose to cope with the scenario: Immediate Automatic Return and Hover and Return.

When Immediate Automatic Return is set as the default coping mechanism, the vehicle will return automatically and immediately.

When Hover and Return is chosen, the vehicle will hover in the airspace where it enters the "Lost" mode, and drain the battery life until 20% to trigger automatic return.