analogRead(D4) not working in saved program

I think the issue is your use of clearInterval(); in setLed - this will clear ALL intervals, including the one calling readBatt. So in reality readBatt will only get called once.

You probably want:

var flashInterval;
function setLed() {
  if (flashInterval) clearInterval(flashInterval);
  if(v < 3) {
    flashInterval = setInterval("digitalPulse(D1, 0, [200,50,100,50]);", 10000);
  } else {
    flashInterval = setInterval("digitalPulse(D1, 0, [200,50]);", 10000);
  }
}