I'm kind of new to all this myself. I've had about 20 flights with Litchi. prendy35 is right, when you set up your flight plan it will tell you distance and time of your flight plan, so you can keep it within your battery life. But in the case where your battery did get to 30%, if you set your battery warning to this value, then all you would get is a warning. At 10%, which is the default value set in the DJI Go app for auto land, I am only assuming at this point it would make a landing right there where it is. I'm not sure, haven't experienced it, but I'm guessing that is what it would do. Maybe someone with more experience with the Litchi app can answer this question a little better, and maybe more true. When I make a flight plan, I just make sure I'm within my battery limits of time before I launch. I do like the Litchi app for some flights because it will not RTH if for some reason I lose RC. With the DJI Go app if there is an obstacle between me and the bird and I lose RC and it RTH's, it would fly straight to me and hit whatever is in between us.