Hi all, I'm flying a P2V+ v3 and using a Nexus 7 (latest version). I usually pull the bird in around 35% battery and store them at this point but this time I wanted to drain each of my 3 batteries much lower since I keep reading to do this every 20 cycles or so. I didn't get any low battery audible alert from the tablet even at 15%. Sound is set full volume and the box is checked in app settings in the tablet for low battery alert. Are there settings in the assistant software that need to be changed?