diff --git a/main.c b/main.c
index 1c89e9b3..de207ac0 100644
--- a/main.c
+++ b/main.c
@@ -90,7 +90,8 @@ int main(int argc, char * argv[]) {
 	
   if (strcmp(sim_yes, "yes") == 0) {
 	  sim_mode = TRUE;
-	  fprintf(stderr, "Sim mode is ON\n");
+	  fprintf(stderr, "Sim mode is turned ON by configuration\n");
+	  sim_config = TRUE;
   }
   if (strcmp(hab_yes, "yes") == 0) {
 	  hab_mode = TRUE;
@@ -641,8 +642,13 @@ int main(int argc, char * argv[]) {
         }
         if (voltage[map[BAT]] == 0.0)
 		batteryVoltage = 4.5;
-	else
+	else  {
 		batteryVoltage = voltage[map[BAT]];
+		if (sim_mode && !sim_config) {	// if Voltage sensor on Battery board is present, exit simulated telemetry mode
+			sim_mode = FALSE; 
+			fprintf(stderr, "Turning off sim_mode since battery sensor is present\n");
+		}
+	}
         batteryCurrent = current[map[BAT]];
 	   
    }
diff --git a/main.h b/main.h
index 7e7a8507..2f5b3fe6 100644
--- a/main.h
+++ b/main.h
@@ -149,6 +149,7 @@ long int newGpsTime;
 
 float axis[3], angle[3], volts_max[3], amps_max[3], batt, speed, period, tempS, temp_max, temp_min, eclipse;
 int i2c_bus0 = OFF, i2c_bus1 = OFF, i2c_bus3 = OFF, camera = OFF, sim_mode = FALSE, SafeMode = FALSE, rxAntennaDeployed = 0, txAntennaDeployed = 0;
+int sim_config = FALSE; // sim mode not set by configuration
 double eclipse_time;
 
 float voltage[9], current[9], sensor[SENSOR_FIELDS], other[3];