diff --git a/application/src/battery.cpp b/application/src/battery.cpp
index 1f69dfb..56599d4 100644
--- a/application/src/battery.cpp
+++ b/application/src/battery.cpp
@@ -79,6 +79,20 @@ Battery::Battery(Settings* newSettings, Logger* newLogger, QObject* parent) : QO
 
     logL("Charger status file: " + (chargerConnectedFile ? chargerConnectedFile->fileName() : notFound));
 
+    // Number: 0 or 1
+    filenames.clear();
+    filenames << "/sys/class/power_supply/ac/present"
+              << "/sys/class/power_supply/axp813-ac/present";
+
+    foreach(const QString& file, filenames) {
+        if(!acConnectedFile && QFile::exists(file)) {
+            acConnectedFile = new QFile(file, this);
+            break;
+        }
+    }
+
+    logL("AC status file: " + (acConnectedFile ? acConnectedFile->fileName() : notFound));
+
     // Number: temperature
     filenames.clear();
     filenames << "/sys/class/power_supply/battery/temp"
@@ -170,6 +184,16 @@ void Battery::updateData()
         chargerConnectedFile->close();
     }
 
+    if(acConnectedFile && acConnectedFile->open(QIODevice::ReadOnly)) {
+        nextAcConnected = acConnectedFile->readLine().trimmed().toInt();
+        if(nextAcConnected != acConnected) {
+            acConnected = nextAcConnected;
+            emit acConnectedChanged(acConnected);
+            logM(QString("AC: %1").arg(acConnected ? "connected" : "disconnected"));
+        }
+        acConnectedFile->close();
+    }
+
     if(stateFile && stateFile->open(QIODevice::ReadOnly)) {
         nextState = (QString(stateFile->readLine().trimmed().toLower()));
         if(nextState != state) {
@@ -183,7 +207,7 @@ void Battery::updateData()
     if(currentFile && currentFile->open(QIODevice::ReadOnly)) {
         current = currentFile->readLine().trimmed().toInt();
         if(!invertDecided) {
-            invertCurrent = (!chargerConnected && current > 10);
+            invertCurrent = (!chargerConnected && !acConnected && current > 10);
             if(invertCurrent) logL("Battery current inverted");
             else              logL("Battery current not inverted");
             invertDecided = true;
@@ -230,3 +254,5 @@ int Battery::getTemperature(){ return temperature; }
 bool Battery::getChargingEnabled() { return chargingEnabled; }
 
 bool Battery::getChargerConnected() { return chargerConnected; }
+
+bool Battery::getAcConnected() { return acConnected; }
diff --git a/application/src/battery.h b/application/src/battery.h
index 508dfaa..b824891 100644
--- a/application/src/battery.h
+++ b/application/src/battery.h
@@ -33,6 +33,7 @@ class Battery : public QObject
     Q_PROPERTY(int current READ getCurrent NOTIFY currentChanged)
     Q_PROPERTY(int maxChargeCurrent READ getMaxChargeCurrent)
     Q_PROPERTY(bool chargerConnected READ getChargerConnected NOTIFY chargerConnectedChanged)
+    Q_PROPERTY(bool acConnected READ getAcConnected NOTIFY acConnectedChanged)
     Q_PROPERTY(QString state READ getState NOTIFY stateChanged)
     Q_PROPERTY(bool chargingEnabled READ getChargingEnabled NOTIFY chargingEnabledChanged)
 
@@ -48,6 +49,7 @@ public:
     int getMaxChargeCurrent();
     bool getCharging();
     bool getChargerConnected();
+    bool getAcConnected();
     QString getState();
 
     QString getHealth();
@@ -62,6 +64,7 @@ private:
     QFile* chargeFile = nullptr;
     QFile* currentFile = nullptr;
     QFile* chargerConnectedFile = nullptr;
+    QFile* acConnectedFile = nullptr;
     QFile* stateFile = nullptr;
     QFile* chargingEnabledFile = nullptr;
     QFile* maxChargeCurrentFile = nullptr;
@@ -75,6 +78,7 @@ private:
     int charge = 100; // 100% full
     int current = 0; // Not charging/discharging
     bool chargerConnected = false; // Charger plugged in
+    bool acConnected = false; // AC plugged in
     QString state = "idle"; // dis/charging, idle, unknown
     bool chargingEnabled = true; // Only ever disabled manually
     int maxChargeCurrent = 0; // Charge current limit in micro amps
@@ -91,9 +95,11 @@ private:
     bool invertDecided = false;
 
     bool nextChargerConnected = chargerConnected;
+    bool nextAcConnected = acConnected;
     QString nextState = state;
     bool nextChargingEnabled = chargingEnabled;
 
+
     QString  nextHealth = health;
     int nextTemperature = temperature;
 
@@ -103,6 +109,7 @@ signals:
     void stateChanged(QString);
     void chargingEnabledChanged(bool);
     void chargerConnectedChanged(bool);
+    void acConnectedChanged(bool);
     void healthChanged(QString);
     void temperatureChanged(int);
 };