diff --git a/lib/Battery/battery.cpp b/lib/Battery/battery.cpp
index 093439c..d4d8c67 100644
--- a/lib/Battery/battery.cpp
+++ b/lib/Battery/battery.cpp
@@ -1,7 +1,7 @@
 /**
  * @file battery.cpp
  * @author Alexander Klein (alex@kleiax.de)
- * @brief 
+ * @brief Contains the implementation of the class Battery
  * @version 0.1
  * @date 2022-02-05
  * 
@@ -28,14 +28,6 @@ void Battery::loop() {
     this->lastMillis = millis();
 }
 
-double Battery::getBatteryVoltage() {
-    return this->batteryVoltage;
-}
-
-uint8_t Battery::getBatteryPercent() {
-    return this->batteryPercent;
-}
-
 double Battery::readInputVoltage() {
     // Reference voltage is 3v3 so maximum reading is 3v3 = 4095 in range 0 to 4095
     double reading = analogRead(this->pin);
@@ -52,7 +44,7 @@ void Battery::calculateBatteryVoltage() {
 }
 
 void Battery::calculateBatteryPercent() {
-    int8_t size = sizeof(this->capacityVoltages) / sizeof(this->capacityVoltages);
+    int8_t size = sizeof(this->capacityVoltages) / sizeof(*this->capacityVoltages);
     uint8_t i;
     for (i = 0; i < size; i++) {
         if (this->batteryVoltage <= this->capacityVoltages[i])
diff --git a/src/SpecialMenus/Akku/menuAkku.cpp b/src/SpecialMenus/Akku/menuAkku.cpp
index 5f83c91..78064ab 100644
--- a/src/SpecialMenus/Akku/menuAkku.cpp
+++ b/src/SpecialMenus/Akku/menuAkku.cpp
@@ -11,8 +11,8 @@
 
 #include "menuAkku.h"
 
-MenuAkku::MenuAkku() {
-
+MenuAkku::MenuAkku(Battery* mainBattery) {
+    this->mainBattery = mainBattery;
 }
 
 void MenuAkku::right() {
@@ -35,7 +35,7 @@ void MenuAkku::yes() {
 void MenuAkku::printMenu() {
     char buf[17];
     uint8_t controllerBattery = -1;
-    uint8_t mainBattery = 77;
+    uint8_t mainBattery = this->mainBattery->getBatteryPercent();
 
     if( controllerBattery != Ps3.data.status.battery ){
         controllerBattery = Ps3.data.status.battery;
diff --git a/src/SpecialMenus/Akku/menuAkku.h b/src/SpecialMenus/Akku/menuAkku.h
index b271246..635a803 100644
--- a/src/SpecialMenus/Akku/menuAkku.h
+++ b/src/SpecialMenus/Akku/menuAkku.h
@@ -15,9 +15,10 @@
 #include <Ps3Controller.h>
 
 #include "menuControl.h"
+#include "battery.h"
 
 /**
- * @brief This class shows Akku informations
+ * @brief This class shows battery informations
  * 
  * Provide information for main battery pack and 
  * PS3-Controller battery pack
@@ -29,7 +30,7 @@ class MenuAkku : public MenuControl {
          * @brief Construct a new Menu Akku object
          * 
          */
-        MenuAkku();
+        MenuAkku(Battery* mainBattery);
 
         void down() override {}
         void up() override {}
@@ -53,9 +54,11 @@ class MenuAkku : public MenuControl {
         void update() override;
 
     private:
-        const uint16_t delay = 5000;
+        const uint16_t delay = 15000;
         uint32_t last_millis = 0;
 
+        Battery* mainBattery;
+
 };
 
 #endif // MENU_AKKU_H
diff --git a/src/main.cpp b/src/main.cpp
index 5156082..e462c3c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -27,6 +27,7 @@
 #include "moveControl.h"
 #include "network.h"
 #include "debugMqtt.h"
+#include "battery.h"
 
 #include "menu.h"
 #include "menuAction.h"
@@ -44,6 +45,7 @@ LiquidCrystal_I2C* lcd;
 OutputBuf* outputBuf;
 DebugMqtt* debugMqtt = nullptr;
 BluetoothSerial* serialBT = nullptr;
+Battery* mainBattery;
 
 bool wifiIsActive;
 
@@ -57,6 +59,8 @@ void setup() {
     Serial.begin(115200);
     char wifiIndicator = 'X';
 
+    mainBattery = new Battery(35, 690000, 220000);
+
     Wire.begin(21, 19);
     // i2cScanner();
     lcd = new LiquidCrystal_I2C(0x3F,16,2);
@@ -109,6 +113,7 @@ void loop() {
     }
     
     driveManager.loop();
+    mainBattery->loop();
 
     // static uint32_t lastMillis = 0;
     // if (millis() - lastMillis > 2000) {
@@ -215,7 +220,7 @@ void makeMenu() {
     MenuCaptureRoute* cap_m = new MenuCaptureRoute(&driveManager);
     MenuAutopilot* auto_m = new MenuAutopilot(&driveManager);
     MenuGPS* gps_m = new MenuGPS(driveManager.getNavigation()->getGPS());
-    MenuAkku* akku_m = new MenuAkku();
+    MenuAkku* akku_m = new MenuAkku(mainBattery);
 
     // Set Menus on LCD
     main_m->setLcd(lcd);