diff --git a/ArduCopter/Parameters.h b/ArduCopter/Parameters.h
index c69707a997..6cab24cbc0 100644
--- a/ArduCopter/Parameters.h
+++ b/ArduCopter/Parameters.h
@@ -125,7 +125,7 @@ public:
         k_param_battery_monitoring = 141,
         k_param_volt_div_ratio,
         k_param_curr_amp_per_volt,
-        k_param_input_voltage,
+        k_param_input_voltage,  // deprecated - can be deleted
         k_param_pack_capacity,
         k_param_compass_enabled,
         k_param_compass,
@@ -263,7 +263,6 @@ public:
                                                 // 4=voltage and current
     AP_Float        volt_div_ratio;
     AP_Float        curr_amp_per_volt;
-    AP_Float        input_voltage;
     AP_Int16        pack_capacity;              // Battery pack capacity less reserve
     AP_Int8         failsafe_battery_enabled;   // battery failsafe enabled
 
diff --git a/ArduCopter/Parameters.pde b/ArduCopter/Parameters.pde
index 75ab7e1951..906e01f2bb 100644
--- a/ArduCopter/Parameters.pde
+++ b/ArduCopter/Parameters.pde
@@ -103,12 +103,6 @@ const AP_Param::Info var_info[] PROGMEM = {
     // @User: Advanced
     GSCALAR(curr_amp_per_volt,      "AMP_PER_VOLT", CURR_AMP_PER_VOLT),
 
-    // @Param: INPUT_VOLTS
-    // @DisplayName: Max internal voltage of the battery voltage and current sensing pins
-    // @Description: Used to convert the voltage read in on the voltage and current pins for battery monitoring.  Normally 5 meaning 5 volts.
-    // @User: Advanced
-    GSCALAR(input_voltage,  "INPUT_VOLTS",      INPUT_VOLTAGE),
-
     // @Param: BATT_CAPACITY
     // @DisplayName: Battery Capacity
     // @Description: Battery capacity in milliamp-hours (mAh)
diff --git a/ArduCopter/config.h b/ArduCopter/config.h
index 27dd2687a2..19715e8f27 100644
--- a/ArduCopter/config.h
+++ b/ArduCopter/config.h
@@ -399,15 +399,6 @@
 #endif
 
 
-
-//////////////////////////////////////////////////////////////////////////////
-// INPUT_VOLTAGE
-//
-#ifndef INPUT_VOLTAGE
- # define INPUT_VOLTAGE                  5.0f
-#endif
-
-
 //////////////////////////////////////////////////////////////////////////////
 //  MAGNETOMETER
 #ifndef MAGNETOMETER