diff --git a/doc/Berechnung Spannungsteiler.pdf b/doc/Berechnung Spannungsteiler.pdf
new file mode 100644
index 0000000..6020c9d
Binary files /dev/null and b/doc/Berechnung Spannungsteiler.pdf differ
diff --git a/lib/Battery/battery.h b/lib/Battery/battery.h
index 3466f3e..3e741fe 100644
--- a/lib/Battery/battery.h
+++ b/lib/Battery/battery.h
@@ -89,8 +89,8 @@ class Battery {
         const float capacityVoltages[21] = {9.82, 10.83, 11.06, 11.12,
                                             11.18, 11.24, 11.3, 11.36,
                                             11.39, 11.45, 11.51, 11.56,
-                                            11.62, 11.74, 11.86, 11.95,
-                                            12.07, 12.25, 12.33, 12.45,
+                                            11.62, 11.74, 11.86, 11.95, // 60 65 70 75
+                                            12.07, 12.25, 12.33, 12.45, // 80 85 90 95
                                             12.6 };
 };
 
diff --git a/lib/Navigation/navigation.h b/lib/Navigation/navigation.h
index 3e50ded..cdf5aa9 100644
--- a/lib/Navigation/navigation.h
+++ b/lib/Navigation/navigation.h
@@ -14,6 +14,7 @@
 
 #include <TinyGPS++.h>
 #include <Arduino.h>
+#include <Wire.h>
 #include <iostream>
 
 #include "route.h"
diff --git a/src/SpecialMenus/Akku/menuAkku.cpp b/src/SpecialMenus/Akku/menuAkku.cpp
index 78064ab..35078ac 100644
--- a/src/SpecialMenus/Akku/menuAkku.cpp
+++ b/src/SpecialMenus/Akku/menuAkku.cpp
@@ -36,6 +36,7 @@ void MenuAkku::printMenu() {
     char buf[17];
     uint8_t controllerBattery = -1;
     uint8_t mainBattery = this->mainBattery->getBatteryPercent();
+    double mainBatteryVolt = this->mainBattery->getBatteryVoltage();
 
     if( controllerBattery != Ps3.data.status.battery ){
         controllerBattery = Ps3.data.status.battery;
@@ -54,9 +55,9 @@ void MenuAkku::printMenu() {
         lcd->setCursor(0, 0);
         lcd->printf("Controller: %s", buf);
         lcd->setCursor(0, 1);
-        lcd->printf("Main: %u%%", mainBattery);
+        lcd->printf("Main: %u%% %4.2fV", mainBattery, mainBatteryVolt);
     }
-    std::cout << "Controller: " << buf << " Main: " << (int) mainBattery << "%" << std::endl;
+    std::cout << "Controller: " << buf << " Main: " << (int) mainBattery << "% " << mainBatteryVolt << "V" << std::endl;
 }
 
 void MenuAkku::update() {
diff --git a/src/main.cpp b/src/main.cpp
index dce9627..b62776c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -60,10 +60,10 @@ void setup() {
     Serial.begin(115200);
     char wifiIndicator = 'X';
 
-    mainBattery = new Battery(35, 690000, 220000);
+    mainBattery = new Battery(35, 692000, 218500);
 
     Wire.begin(21, 19);
-    // i2cScanner();
+    i2cScanner();
     lcd = new LiquidCrystal_I2C(0x3F,16,2);
     lcd->init();
     lcd->clear();
@@ -189,14 +189,15 @@ void i2cScanner() {
             std::cout << "I2C device found at address 0x";
             if (address<16)
                 std::cout << "0";
-            std::cout << std::hex << address << std::endl;
+            std::cout << std::hex << (int) address << std::endl;
+            // std::cout << (int) address << std::endl;
             nDevices++;
         }
         else if (error==4) {
             std::cout << "Unknow error at address 0x";
             if (address<16)
                 std::cout << "0";
-            std::cout << std::hex << address << std::endl;
+            std::cout << std::hex << (int) address << std::endl;
         }    
     }
     if (nDevices == 0)