i find it quite interesting the amount of posts where people are complaining about settings ,in respect of the batteries abilities to fly the drone at very low voltages ,running batteries down to low cell voltages is one of the ways to shorten their life span ,and if you take off with a very low battery you are just adding to problem as the battery reaches a low charge it struggles to handle the higher current loads that the ESC s place on the cells when being asked to provide more power for climbing or flying fast those few extra minutes of flight time when the battery is low just put an extra strain on their ability to work as they should ,i would rather sacrifice a couple of minutes flight time ,and keep my batteries working for as long as they can