Don’t throw away that Electronic Speed Controller until you make sure that it’s really shot.
I’ve had about 3 Speed controllers fail on me, and threw them away. A lot of money down the drain. But when the last 2 failed on me, I did the following and they are still in service.
I’ve found that it’s the BEC (Battery Eliminator Circuit) of the device that fails more often than not, and the motor controller is still fully functional. I purchased the FMA VRL1 Voltage regulator and inexpensive 2S-1P 850-1000 MAH Li-po’s. Clip the red wire out of the Speed control cable, and plug it into the Throttle position on the Receiver. The VRL1 goes in on the Batt. position on the receiver.
With this setup I get sometimes 2-3 days of flying on one charge on the Receiver Battery, and even better there is always a regulated 5 volts going to the receivers and servos. And as a bonus, the VRL1 has indicator lights to keep you apprised of the condition of your Receiver battery.
For about $40 you can get this package, and save the cost of a new Speed Controller.
Try it – You’ll Like it