You need to do some homework to learn the basics of e-power systems before you buy anything. Using a servo operated switch to turn off a motor is quite obsolete. You need an ESC (electronic speed control) which gives you throttle control. The ESC you buy must have a capacity for the number of cells in your power back and the ability to handle the amperage that your power system will draw. BEC (battery eliminator circuit) is a feature of some ESC's that taps the power pack to supply your receiver so that you will not need a separate receiver pack. It will also include an automatic voltage shutoff to the motor. Can't imagine what could be "unsafe" about this. A quality charger is a must and it will be about $100. You need a peak-detection charger that will handle the packs you will be using which runs from a 12v. supply. Flying e-power successfully is not cheap and needs serious planning.

Dave Segal