Does anyone know if the Vision App use the same audible warning it uses for low battery notification for any other purpose?

I heard it today about 4 or 5 minutes into a flight that started with a full battery, but was "busy" flying my Phantom in ATTI mode near a tree line at a few hundred feet out, and did not want to look down at my smartphone.  I got away from the trees and was starting a quick flight back to me, but it had already stopped the audible, and my battery level was 78% when I finally looked.

Puzzling.

Does anyone know if the Vision App use the same audible warning it uses for low battery notification for any other purpose?

I heard it today about 4 or 5 minutes into a flight that started with a full battery, but was "busy" flying my Phantom in ATTI mode near a tree line at a few hundred feet out, and did not want to look down at my smartphone.  I got away from the trees and was starting a quick flight back to me, but it had already stopped the audible, and my battery level was 78% when I finally looked.

Puzzling.