diff --git a/openrtx/include/battery.h b/openrtx/include/battery.h
index 61d51191..aed28038 100644
--- a/openrtx/include/battery.h
+++ b/openrtx/include/battery.h
@@ -20,10 +20,11 @@
 #ifndef BATTERY_H
 #define BATTERY_H
 
-/* This function uses battery charge tables to convert a battery voltage into a
+/**
+ * This function uses battery charge tables to convert a battery voltage into a
  * charge percentage.
- * @param vbat: the voltage read from the battery in volt
- * @return the charge percentage
+ * @param vbat: the voltage read from the battery in volt.
+ * @return the charge percentage.
  */
 float battery_getCharge(float vbat);
 
diff --git a/openrtx/src/battery.c b/openrtx/src/battery.c
index c7dbaf15..62026f8e 100644
--- a/openrtx/src/battery.c
+++ b/openrtx/src/battery.c
@@ -42,7 +42,14 @@ float bat_v_max = 0.0;
 #error Please define a battery type into platform/targets/.../hwconfig.h
 #endif
 
-float battery_getCharge(float vbat) {
-    // Perform a linear interpolation between minimum and maximum charge values
+float battery_getCharge(float vbat)
+{
+    #ifndef BAT_NONE
+    // Perform a linear interpolation between minimum and maximum charge values.
     return (vbat - bat_v_min) / (bat_v_max - bat_v_min);
+    #else
+    // Return full charge if no battery is present.
+    (void) vbat;
+    return 1.0f;
+    #endif
 }