diff --git a/src/main.cpp b/src/main.cpp
index bacf497..76e27c0 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -45,6 +45,21 @@ String statusmsg = "";
 uint8_t loraBuffer[9]; //  Lora Data Packet
 uint32_t lastmillis;
 
+// Supply Voltage
+uint16_t readSupplyVoltage() {
+  uint16_t temp = 0;
+  analogReference(VDD);
+  VREF.CTRLA = VREF_ADC0REFSEL_1V5_gc;
+  ADC0.CTRLD = ADC_INITDLY_DLY256_gc;
+  ADC0_CTRLB = ADC_SAMPNUM_ACC64_gc;
+  uint16_t reading = analogRead(ADC_INTREF);
+  temp = reading / 64;
+  uint32_t intermediate = 1534500;
+  reading = 0;
+  reading = intermediate / temp;
+  return reading;
+}
+
 // Button Handler Function
 void handler(Button2& btn) {
   switch (btn.getClickType()) {
@@ -109,6 +124,8 @@ void updateDisplay() {
       oled.println(buffer[3]);
       oled.print("Speed:  ");
       oled.println(buffer[4]);
+      oled.print("Bat:    ");
+      oled.println((float)readSupplyVoltage()/1000);
     } else {
       if (hasFix != oldFix){
         oled.clear();
@@ -123,6 +140,8 @@ void updateDisplay() {
       oled.println(interval);
       oled.print("Packet: ");
       oled.println(Frame_Counter_Tx);
+      oled.print("Bat:    ");
+      oled.println((float)readSupplyVoltage()/1000);
     }
     oled.print(statusmsg);
     oled.println("                    ");