Answer to: Why doesn't it fly?How old are the batterys you are using? Over time lithium batterys lose both capacity and the ability to deliver current. Which results in the quadcopter not have as much punch as it used to and will have shorter flight times. This aging of the battery can be accelerated by doing things like leaving them fully charged, leaving them fully discharged, and storing them in a overly hot environment. So try some new batterys and that should fix it. Also I don't know what type of battery charger you have but a smart charger would be best for storage charging and keeping track of your batterys capacity, which helps show age and condition.