Thanks EVB;

1. Yes; Last test with a bare pro-mini 3.3v
2. I did that...

// Enable and select radio type attached
#define MY_RADIO_RF24
#include <MySensors.h>
uint32_t SLEEP_TIME = 900000;  // sleep time between reads (in seconds * 1000 )
int oldBatteryPcnt = 0;
#define FULL_BATTERY 3 // 3V for 2xAA alkaline. Adjust if you use a different battery setup.
void setup()
{
}
void presentation()
{
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Battery Meter", "1.0");
}
void loop()
{
//    // get the battery Voltage
//    long batteryMillivolts = hwCPUVoltage();
//    int batteryPcnt = batteryMillivolts / FULL_BATTERY / 1000.0 * 100 + 0.5;
//  
//    if (oldBatteryPcnt != batteryPcnt) {
//      sendBatteryLevel(batteryPcnt);
//      oldBatteryPcnt = batteryPcnt;
//  }
  sleep(SLEEP_TIME);
}

Again : 4.2mA (no sleep )
So sad ! :disappointed_relieved:

May I suggest you think about self discharging parameter in case of a reloadable battery and a long life time ?

@Yveaux
YESSSSSS !<
That was the last problèm to solve.
Back with my own MySensors routine all is perfect ! (8uA in sleep mode)
I am very happy now and I thank all those who assisted me.
You've made my day !
Gilles