diff --git a/firmware/sensors.ino b/firmware/sensors.ino
index b6885f0..eb02526 100755
--- a/firmware/sensors.ino
+++ b/firmware/sensors.ino
@@ -50,6 +50,10 @@ float fetchWindspeed() {
 float getBatteryVoltage() {
   uint16_t raw = analogRead(A0);
   float volt = raw / 1023.0;
+#ifdef BOARD_03962A
   return volt * 6.79;
+#else
+  return volt * 4.0;
+#endif
 }