diff --git a/include/mess_Ub.h b/include/mess_Ub.h
index b46a741..0f803ef 100644
--- a/include/mess_Ub.h
+++ b/include/mess_Ub.h
@@ -1,24 +1,22 @@
-#include <Arduino.h>
-
-const float MinimalSpannung = 2.85;
-float korectur = 1.02910;
-char floatString[15] = {0};
-float AKKU;
-
-float getBattery(float kor = 1.000)
-{
-  #if (NOBATT == 1)
-    Serial.print("Batterie:\t\t    3.05 V\n");
-    return 3.05;
-  #endif
-  float valA0 = analogRead(A0);
-  valA0 = valA0 * 3.7;	// (R1 + r1 + r2) / r2
-						// r1 und r2 Spannungsteiler
-						// r1 = 270k, r2 = 100k
-						// Spannungsbereich = 5.2 Volt
-  valA0= valA0 / 1024;
-  valA0 = valA0 * kor;
-  dtostrf(valA0,7,2,floatString);
-  Serial.printf("Batterie:\t\t %s V\n", floatString);
-  return valA0;
+#include <Arduino.h>
+
+ADC_MODE(ADC_VCC);
+
+const float MinimalSpannung = 2.85;
+float korectur = 9.2800899887514060742407199100112e-4;
+char floatString[15] = {0};
+float AKKU;
+
+float getBattery()
+{
+  #if (NOBATT == 1)
+    Serial.print("Batterie:\t\t    3.05 V\n");
+    return 3.05;
+  #endif
+  int Vcc = ESP.getVcc();
+  float VCC = Vcc * korectur ;
+  Serial.printf("Rohdaten: %d, ", Vcc);
+  dtostrf(VCC,7,2,floatString);
+  Serial.printf("Vcc: %s V\n", floatString);
+  return VCC;
 }
\ No newline at end of file
diff --git a/include/mess_Ub_old.h b/include/mess_Ub_old.h
new file mode 100644
index 0000000..b46a741
--- /dev/null
+++ b/include/mess_Ub_old.h
@@ -0,0 +1,24 @@
+#include <Arduino.h>
+
+const float MinimalSpannung = 2.85;
+float korectur = 1.02910;
+char floatString[15] = {0};
+float AKKU;
+
+float getBattery(float kor = 1.000)
+{
+  #if (NOBATT == 1)
+    Serial.print("Batterie:\t\t    3.05 V\n");
+    return 3.05;
+  #endif
+  float valA0 = analogRead(A0);
+  valA0 = valA0 * 3.7;	// (R1 + r1 + r2) / r2
+						// r1 und r2 Spannungsteiler
+						// r1 = 270k, r2 = 100k
+						// Spannungsbereich = 5.2 Volt
+  valA0= valA0 / 1024;
+  valA0 = valA0 * kor;
+  dtostrf(valA0,7,2,floatString);
+  Serial.printf("Batterie:\t\t %s V\n", floatString);
+  return valA0;
+}
\ No newline at end of file
diff --git a/platformio.ini b/platformio.ini
index 58c282a..24d2d41 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -25,7 +25,7 @@ lib_deps =
 
 build_flags =
     -DTEMPTEST33=1
-    -DNOBATT=1
+    -DNOBATT=0
     -DMaxErrCount=30
     -DMQTT=0
     
diff --git a/src/main.cpp b/src/main.cpp
index f4cf2b5..ce20b5f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -118,7 +118,7 @@ void setup() {
   //initADS();
   //init_MCP9808();
   #endif
-  AKKU = getBattery(korectur);  // ca. 170 ms
+  AKKU = getBattery();  // ca. 170 ms
   // ca. 280 ms
   if (F_HTU_21D == true){
     read_HTU21D();