I'm building a robot with 15+ SG90 micro servo's.
To power it, I've bought a 2C lipo battery, and a 5/6 volt BEC.
I've hooked up the BEC's 5v (red) to all the servo's red, and the BEC's ground to the servo's ground, as well as some arduino grounds (that control the servo).
The BEC has an on/off switch. When the BEC is switched to off, and I plug the battery into the BEC, a surge of current flows through to the motors. They all "twitch" very rapidly, and I've had some wires melt/smoke.
My questions are: