what is the best way to discharge my phantom vision 2 battery if its at full charge and im not going to be using it for some time, I know go out and fly it but its real wet here right now so gonna wait I have heard take props off and let it run is that good for it? how long does that take to bring the battery say down to 50% how long will it take roughy if I just turn the copter on and let it sit without the blades running to take the battery down to 50%? Just dont want to wreck the battery by leaving it fully charged