Battery indicator optimised

src/gui.cpp

@@ -458,6 +458,7 @@ void BuildDisplay() {
   SNRold = 254;
   af_counterold = 254;
   batteryold = 6;
+  batteryVold = 0;
   strcpy(programTypePrevious, "0");
   strcpy(radioIdPrevious, "0");
   programServicePrevious = "0";

src/gui.h

@@ -86,6 +86,7 @@ extern byte touchrotating;
 extern byte unit;
 extern char programTypePrevious[18];
 extern char radioIdPrevious[6];
+extern float batteryVold;
 extern int ActiveColor;
 extern int ActiveColorSmooth;
 extern int AMLevelOffset;