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Hi Carmelo42. Here your sketch modified. You need to define all MySensors parameters before to include the library. I add 2 variables (BATT_IN_PIN, BATT_VCC_PIN). You need to set Pins. I think, it'll run now. I don't check if the measure of the temperature is correct.

// avec mesure de la batterie avec Vcc.h
// ok avec pile CR2032 et docATmega328 8Mhz MYSBootloader et efuse 0x07
// pour DS18B20 SANS resistance
// nécessite la lib OneWire : OneWireNoResistor-master.zip
//
// boards.txt :
//proMYSBL.name=docATmega328 8Mhz MYSBootloader

//proMYSBL.upload.tool=avrdude
//proMYSBL.upload.protocol=arduino
//proMYSBL.upload.maximum_size=30720
//proMYSBL.upload.maximum_data_size=2048
//proMYSBL.upload.speed=115200

//proMYSBL.bootloader.tool=avrdude
//proMYSBL.bootloader.low_fuses=0xE2
//proMYSBL.bootloader.high_fuses=0xDA
//proMYSBL.bootloader.extended_fuses=0x07
//proMYSBL.bootloader.unlock_bits=0x3F
//proMYSBL.bootloader.lock_bits=0x0F
//proMYSBL.bootloader.file=MySBootloader/MYSBootloader.hex

//proMYSBL.build.mcu=atmega328p
//proMYSBL.build.f_cpu=8000000L
//proMYSBL.build.board=AVR_UNO
//proMYSBL.build.core=arduino:arduino
//proMYSBL.build.variant=arduino:standard
#define MY_NODE_ID 123
#define MY_RADIO_NRF24

#include <SPI.h>
#include <MySensors.h>

#include <DallasTemperature.h>
#include <OneWire.h>
#include <Vcc.h>

#define ONE_WIRE_BUS 4 // Pin where dallase sensor is connected
#define ONE_WIRE_GND 5
#define ONE_WIRE_VCC 3


#define ID_BatPcnt 1
#define ID_Bat 2
#define BATT_IN_PIN 1
#define BATT_VCC_PIN 2

#define MAX_ATTACHED_DS18B20 16


// 60000 = 1 minute
// 12000 = 2 minutes
// 300000 = 5 minutes
// 600000 = 10 minutes
#define SLEEP_TIME 300000  // Sleep time between reads (in milliseconds)


const float VccMin   = 2.3;             // Vcc mini attendu, en Volts.
const float VccMax   = 3;           // Vcc Maximum attendu, en Volts (2 piles AA neuves)
const float VccCorrection = 2.52/2.6; // calibration : Vcc mesuré au multimètre / Vcc mesuré par l'Arduino par vcc.Read_Volts() dans sketch 1/2
Vcc vcc(VccCorrection);

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
//MySensor gw;
MyMessage msgBAT_PCNT(ID_BatPcnt,V_VAR1); // on utilise le type V_VAR1 pour le % de charge des piles
MyMessage msgBAT(ID_Bat,V_VAR2);          // on utilise le type V_VAR2 pour la tension des piles
float lastTemperature[MAX_ATTACHED_DS18B20];
uint8_t numSensors = 0;
boolean receivedConfig = false;
boolean metric = true;
// Initialize temperature message
MyMessage msg(0, V_TEMP);
int oldvalue = 0;

void before()
{
  // Startup up the OneWire library
  sensors.begin();
}

void setup()
{
  // Startup OneWire
#ifdef ONE_WIRE_VCC
  pinMode(ONE_WIRE_VCC, OUTPUT);
  digitalWrite(ONE_WIRE_VCC, HIGH);
#endif
#ifdef ONE_WIRE_GND
  pinMode(ONE_WIRE_GND, OUTPUT);
  digitalWrite(ONE_WIRE_GND, LOW);
#endif
  analogReference(INTERNAL);
  pinMode(BATT_IN_PIN, INPUT);
  pinMode(BATT_VCC_PIN, OUTPUT);
  digitalWrite(BATT_VCC_PIN, LOW);

    
}

void presentation()
{
  // Startup and initialize MySensors library. Set callback for incoming messages.
 // gw.begin();
  //gw.begin(NULL, node_id, true);
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("TS sR batt", "2.0");

  // Fetch the number of attached temperature sensors
  numSensors = sensors.getDeviceCount();

  sensors.setWaitForConversion(false);//saves a few mAs per read :-) to debug

  // Present all sensors to controller
  present(ID_BatPcnt, S_CUSTOM);  // type S_CUSTOM pour le capteur "% de charge"
  present(ID_Bat, S_CUSTOM);      // type S_CUSTOM pour le capteur "tension"
  for (int i = 0; i < numSensors && i < MAX_ATTACHED_DS18B20; i++) {
    present(i, S_TEMP);  
  }
}

void loop()
{
  // Process incoming messages (like config from server)
  //gw.process();
// mesure de Vcc
      float v = vcc.Read_Volts();
      // calcul du % de charge batterie
      float p = 100 * ((v - VccMin) / (VccMax - VccMin));
      // On envoie les données des capteurs et de l'état de la batterie au Gateway
      //gw.sendBatteryLevel(p);  // Inutile...
      send(msgBAT_PCNT.set(p, 1)); // 1 décimale
      send(msgBAT.set(v, 3));      // 2 décimales
  // Fetch temperatures from Dallas sensors
  // Fetch temperatures from Dallas sensors
  sensors.requestTemperatures();

  sleep(750);//wait for conversion in sleep mode

  // Read temperatures and send them to controller
  for (int i = 0; i < numSensors && i < MAX_ATTACHED_DS18B20; i++) {

    // Fetch and round temperature to one decimal
    float temperature = static_cast<float>(static_cast<int>((getConfig().isMetric ? sensors.getTempCByIndex(i) : sensors.getTempFByIndex(i)) * 10.)) / 10.;

    // Only send data if temperature has changed and no error
    send(msg.setSensor(i).set(temperature, 1));
      lastTemperature[i] = temperature;
    //if (lastTemperature[i] != temperature && temperature != -127.00) {

      // Send in the new temperature
      
    //}
  }
 
  sleep(SLEEP_TIME);//wake on interrupt or after sleep-time
}

If you need more info : http://www.diyprojects.io/mysensors-v2-discover-news-migrate-old-sketchs/ (or http://www.projetsdiy.fr/mysensors-version2-decouverte-nouveautes-convertir-sketch/ in french)

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