Code:

/**

analog 0 will be connected to battery to check voltage
digital 1 will be connected to master power relay
digital 2 will be connected to ez-b relay
**/

while (true) {

  if (analogRead(0) < 600) {

    // disable master relay that provides all power
    digitalWrite(1, LOW);

    // no need to do anything because the power will be cut 
  }

  // check if the green led on the ez-b is not on
  if (!digitalRead(2)) {

    // cycle ezb power with relay
    digitalWrite(2, low);
    delay(2000);
    digitalWrite(2, high);
    delay(5000);
  }

  delay(10000);
}