diff --git a/libraries/APO/AP_BatteryMonitor.cpp b/libraries/APO/AP_BatteryMonitor.cpp
index e5550d2798..835f3072d2 100644
--- a/libraries/APO/AP_BatteryMonitor.cpp
+++ b/libraries/APO/AP_BatteryMonitor.cpp
@@ -8,3 +8,5 @@
 namespace apo {
 
 } // apo
+
+// vim:ts=4:sw=4:expandtab
diff --git a/libraries/APO/AP_BatteryMonitor.h b/libraries/APO/AP_BatteryMonitor.h
index 7f82db349d..96b94bc46d 100644
--- a/libraries/APO/AP_BatteryMonitor.h
+++ b/libraries/APO/AP_BatteryMonitor.h
@@ -13,39 +13,41 @@ namespace apo {
 
 class AP_BatteryMonitor {
 public:
-	AP_BatteryMonitor(uint8_t pin, float voltageDivRatio, float minVolt, float maxVolt) :
-		_pin(pin), _voltageDivRatio(voltageDivRatio),
-		_minVolt(minVolt), _maxVolt(maxVolt), _voltage(maxVolt) {
-	}
+    AP_BatteryMonitor(uint8_t pin, float voltageDivRatio, float minVolt, float maxVolt) :
+        _pin(pin), _voltageDivRatio(voltageDivRatio),
+        _minVolt(minVolt), _maxVolt(maxVolt), _voltage(maxVolt) {
+    }
 
-	void update() {
-		// low pass filter on voltage
-		_voltage = _voltage*.9 + (analogRead(_pin)/255)*_voltageDivRatio*0.1;
-	}
+    void update() {
+        // low pass filter on voltage
+        _voltage = _voltage*.9 + (analogRead(_pin)/255)*_voltageDivRatio*0.1;
+    }
 
-	/**
-	 * Accessors
-	 */
-	float getVoltage() {
-		return _voltage;
-	}
+    /**
+     * Accessors
+     */
+    float getVoltage() {
+        return _voltage;
+    }
 
-	uint8_t getPercentage() {
-		float norm = (_voltage-_minVolt)/(_maxVolt-_minVolt);
-		if (norm < 0) norm = 0;
-		else if (norm > 1) norm = 1;
-		return 100*norm;
-	}
+    uint8_t getPercentage() {
+        float norm = (_voltage-_minVolt)/(_maxVolt-_minVolt);
+        if (norm < 0) norm = 0;
+        else if (norm > 1) norm = 1;
+        return 100*norm;
+    }
 
 private:
 
-	uint8_t _pin;
-	float _voltageDivRatio;
-	float _voltage;
-	float _minVolt;
-	float _maxVolt;
+    uint8_t _pin;
+    float _voltageDivRatio;
+    float _voltage;
+    float _minVolt;
+    float _maxVolt;
 };
 
 } // namespace apo
 
 #endif /* AP_BATTERYMONITOR_H_ */
+
+// vim:ts=4:sw=4:expandtab