I'm building my first electric plane and have problems with speed controllers. One battery is powering the receiver, servos, and motor. The first speed control (E-Flight 10A) worked for one flight but afterwards there was very weak power to the servos.

A second speed control was bought (E-flight 10A pro) but this speed controller causes the motor to stutter and shutoff after several seconds. I've tried programming it every way and it still does it. I'm not sure what's wrong. I'm been using a fully charged battery but it's like the low voltage shut off is always being triggered.