B4R Question esp8266 nodemcu status battery and recharge

Sub Process_Globals
   Public Serial1 As Serial
   Private Timer1 As Timer
   Private VCC As UInt 'ignore
End Sub

Private Sub AppStart
   Serial1.Initialize(115200)
   Log("AppStart")
   Timer1.Initialize("Timer1_Tick", 1000)
   Timer1.Enabled = True
End Sub

Private Sub Timer1_Tick
   RunNative("GetVCC", Null)
   Log(VCC)
End Sub

#if C
 ADC_MODE(ADC_VCC);
void GetVCC (B4R::Object* o) {
   b4r_main::_vcc = ESP.getVcc();
}
#End if