AP_BattMonitor: Remove unneeded memebers

is_powering_off was only used for solo, and was just an intermediate
copy before updating notify

libraries/AP_BattMonitor/AP_BattMonitor.cpp

@@ -246,10 +246,6 @@ bool AP_BattMonitor::healthy(uint8_t instance) const {
     return instance < _num_instances && _BattMonitor_STATE(instance).healthy;
 }
 
-bool AP_BattMonitor::is_powering_off(uint8_t instance) const {
-    return instance < _num_instances && _BattMonitor_STATE(instance).is_powering_off;
-}
-
 /// has_current - returns true if battery monitor instance provides current info
 bool AP_BattMonitor::has_current(uint8_t instance) const
 {

libraries/AP_BattMonitor/AP_BattMonitor.h

@@ -67,7 +67,6 @@ public:
     struct BattMonitor_State {
         uint8_t     instance;           // the instance number of this monitor
         bool        healthy;            // battery monitor is communicating correctly
-        bool        is_powering_off;    // true if the battery is about to power off
         float       voltage;            // voltage in volts
         float       current_amps;       // current in amperes
         float       current_total_mah;  // total current draw since start-up
@@ -95,9 +94,6 @@ public:
     bool healthy(uint8_t instance) const;
     bool healthy() const { return healthy(AP_BATT_PRIMARY_INSTANCE); }
 
-    bool is_powering_off(uint8_t instance) const;
-    bool is_powering_off() const { return is_powering_off(AP_BATT_PRIMARY_INSTANCE); }
-
     /// has_current - returns true if battery monitor instance provides current info
     bool has_current(uint8_t instance) const;
     bool has_current() const { return has_current(AP_BATT_PRIMARY_INSTANCE); }
@@ -138,9 +134,6 @@ public:
     /// set_monitoring - sets the monitor type (used for example sketch only)
     void set_monitoring(uint8_t instance, uint8_t mon) { _monitoring[instance].set(mon); }
 
-    bool get_watt_max() { return get_watt_max(AP_BATT_PRIMARY_INSTANCE); }
-    bool get_watt_max(uint8_t instance) { return _watt_max[instance]; }
-
     /// true when (voltage * current) > watt_max
     bool overpower_detected() const;
     bool overpower_detected(uint8_t instance) const;

libraries/AP_BattMonitor/AP_BattMonitor_SMBus_Solo.cpp

@@ -82,8 +82,7 @@ void AP_BattMonitor_SMBus_Solo::timer()
 
         if (_button_press_count >= BATTMONITOR_SMBUS_SOLO_BUTTON_DEBOUNCE) {
             // battery will power off
-            _state.is_powering_off = true;
+            AP_Notify::flags.powering_off = true;
-
         } else if (pressed) {
             // battery will power off if the button is held
             _button_press_count++;
@@ -91,9 +90,8 @@ void AP_BattMonitor_SMBus_Solo::timer()
         } else {
             // button released, reset counters
             _button_press_count = 0;
-            _state.is_powering_off = false;
+            AP_Notify::flags.powering_off = false;
         }
-        AP_Notify::flags.powering_off = _state.is_powering_off;
     }
 
     read_temp();