local build

boards/shields/cornedeon54/cornedeon54.dtsi

@@ -11,6 +11,17 @@
     chosen {
         zmk,kscan = &kscan0;
         zmk,physical-layout = &default_layout;
+        zmk,battery = &vbatt;
+    };
+
+    vbatt: battery-divider {
+        compatible = "zmk,battery-voltage-divider";
+        label = "BATTERY";
+        /* PIN AIN6 (P0.31) */
+        io-channels = <&adc 6>;
+        /* Embedded nice!nano divider (100k / 100k) */
+        output-ohms = <100000>;
+        full-ohms = <200000>;
     };
 
     kscan0: kscan {
@@ -121,5 +132,4 @@ RC(4,0) RC(4,1) RC(4,2) RC(4,3) RC(4,4) RC(4,5)  RC(4,6) RC(4,7) RC(4,8) RC(4,9)
         >;
     };
 
-
 };