diff --git a/firmware/sensors.ino b/firmware/sensors.ino
index eb02526..36ff461 100755
--- a/firmware/sensors.ino
+++ b/firmware/sensors.ino
@@ -53,7 +53,7 @@ float getBatteryVoltage() {
 #ifdef BOARD_03962A
   return volt * 6.79;
 #else
-  return volt * 4.0;
+  return volt * 4.2;
 #endif
 }