diff --git a/firmware/v01/v01.ino b/firmware/v01/v01.ino
index 6361f0f..b8ae96d 100644
--- a/firmware/v01/v01.ino
+++ b/firmware/v01/v01.ino
@@ -37,15 +37,14 @@ Adafruit_SSD1306 display(OLED_RESET);
 
 
 // Function declarations
-void zero();
-void one();
-void two();
-void three();
-void four();
-void read_serial();
-void write_serial();
-void config();
-void batt_icon();
+void one();				// Menu one
+void two();				// Menu two	
+void three();			// Menu three
+void four();			// Menu four
+void read_serial();		// Menu that reads the serial
+void write_serial();	// Menu that writes to serial
+void config();			// Configuration menu
+void batt_icon();		// Draws the battery icon acording to value
 
 
 // Variables creation
@@ -83,12 +82,6 @@ void setup() {    // BEGIN SETUP ------------------------------------
   display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 128x32)
   // init done
   
-  // Show image buffer on the display hardware.
-  // Since the buffer is intialized with an Adafruit splashscreen
-  // internally, this will display the splashscreen.
-  //display.display();
-  //delay(2000);  // Wait 2 seconds
-
 
   // initialize timer1 --------------------------------------- 
   noInterrupts();           // disable all interrupts
@@ -118,14 +111,13 @@ void setup() {    // BEGIN SETUP ------------------------------------
   display.clearDisplay();
   display.display();
 
-  
 }   // END SETUP --------------------------------------------------------------------
 
 
 
 // Timer compare interrupt service routine --------------------------
-ISR(TIMER1_COMPA_vect) // Here we chose between the blinker sequence
-{                      // or to show the temperature on the LEDs
+ISR(TIMER1_COMPA_vect) //
+{                      //
 	if (!rUP) {
 		if (menuState == 1) {
 			menuState = 1;
@@ -205,6 +197,7 @@ void loop() {
 
 	batt_val = analogRead(batt);
 	
+// Routine to check the battery analog value for calibration
 /*	display.drawRect(0, 8, 168, 24, BLACK);
 	display.display();
 	display.clearDisplay();
@@ -213,7 +206,7 @@ void loop() {
 	display.setCursor(50,18);
 	display.println(batt_val);
 	batt_icon();
-	display.display();	*/
+	display.display();*/
 
 
   
@@ -261,10 +254,23 @@ void batt_icon (void) {
 	}
 
 	else if ((batt_val > 901) & (batt_val < 962)) {
-	// Draw the battery icon - Half full battery
+	// Draw the battery icon - 2/3 battery
 	display.drawRect(111, 1, 16, 6, WHITE);
-	display.drawRect(119, 2, 7, 4, WHITE);
-	display.drawRect(120, 3, 5, 2, WHITE);
+	display.drawRect(116, 2, 10, 4, WHITE);
+	display.drawRect(117, 3, 8, 2, WHITE);
+	display.drawPixel(110, 3, WHITE);
+	display.drawPixel(110, 4, WHITE);
+	display.drawPixel(109, 3, WHITE);
+	display.drawPixel(109, 4, WHITE);
+	display.drawPixel(108, 3, WHITE);
+	display.drawPixel(108, 4, WHITE);
+	}
+
+	else if ((batt_val > 840) & (batt_val < 901)) {
+	// Draw the battery icon - 1/3 battery
+	display.drawRect(111, 1, 16, 6, WHITE);
+	display.drawRect(121, 2, 5, 4, WHITE);
+	display.drawRect(122, 3, 3, 2, WHITE);
 	display.drawPixel(110, 3, WHITE);
 	display.drawPixel(110, 4, WHITE);
 	display.drawPixel(109, 3, WHITE);
@@ -287,21 +293,6 @@ void batt_icon (void) {
 	}
 }
 
-void zero (void) {
-
-  display.drawRect(0, 8, 168, 24, BLACK);
-  display.display();
-  display.setTextSize(1);
-  display.setTextColor(WHITE);
-  display.setCursor(1,12);
-  display.println("Read NMEA0183");
-  display.setCursor(1,22);
-  display.println("Write NMEA0183");
-  batt_icon();
-  display.display();
-
-}
-
 void one (void) {
 
   display.drawRect(0, 8, 168, 24, BLACK);