Originally Posted by mystman
What about flying with a cheap digital itchen timer (or a kitchentimer app for your smartphone)? I'm using it and set it to 5:00 minutes (Thats the time where my batteries start getting weak) Most of my batteries still have about 3.7V after stopping.
That's a feature I love about the Turnigy with er9x. You can set the timer to activate whenever the throttle is not zero. So it keeps a very accurate time. In fact, you can have the timer speed up or slow down according to where the throttle stick is to approximate better the power draw.