I have a 7.4v 2200mAh battery that I am using to power a servo motor. Instead of using a separate power source for the Arduino, I was wondering If I could just use the one battery. Would using the 7.4v 2200mAh battery overload the Arduino pro mini and if so what circuit board layout would prevent this, thanks.
The Promini's regulator can only support 150mA. It can't be used to power a servo motor, which can take an amp or more. Use a seperate 5V or 6V regulator for your servo.