diff --git a/src/solid/backends/iokit/iokitbattery.h b/src/solid/backends/iokit/iokitbattery.h
index e2a0d3fc393222eb632631aaa334cbb8618d107a..995391b91593e401200e6f87febbfe8f5af9f848 100644
--- a/src/solid/backends/iokit/iokitbattery.h
+++ b/src/solid/backends/iokit/iokitbattery.h
@@ -52,7 +52,15 @@ public:
 
     Solid::Battery::ChargeState chargeState() const;
 
+    // ### the ones below are TODO
+    Solid::Battery::Technology technology() const { return Solid::Battery::UnknownTechnology; }
+    double energy() const { return 0.0; }
+    double energyRate() const { return 0.0; }
+    double voltage() const { return 0.0; }
+
 Q_SIGNALS:
+    void energyChanged(double energy, const QString &udi);
+    void energyRateChanged(double energyRate, const QString &udi);
     void chargePercentChanged(int value, const QString &udi);
     void capacityChanged(int value, const QString &udi);
     void chargeStateChanged(int newState, const QString &udi);