diff --git a/libraries/SITL/SIM_Plane.cpp b/libraries/SITL/SIM_Plane.cpp
index 92fc5d8213..d25bea6760 100644
--- a/libraries/SITL/SIM_Plane.cpp
+++ b/libraries/SITL/SIM_Plane.cpp
@@ -308,6 +308,9 @@ void Plane::calculate_forces(const struct sitl_input &input, Vector3f &rot_accel
     
     float thrust     = throttle;
 
+    battery_voltage = sitl->batt_voltage - 0.7*throttle;
+    battery_current = 50.0f*throttle;
+
     if (ice_engine) {
         thrust = icengine.update(input);
     }