use-session-bus.patch

--- a/Battery.cxx
+++ b/Battery.cxx
@@ -41,7 +41,7 @@
     hide();
   else
   {
-    QDBusConnection::systemBus()
+    QDBusConnection::sessionBus()
       .connect("org.freedesktop.UPower",
                "/org/freedesktop/UPower",
                "org.freedesktop.DBus.Properties",
@@ -55,7 +55,7 @@
                                      "org.freedesktop.DBus.Properties",
                                      "Get");
     msg << QLatin1String("org.freedesktop.UPower") << QLatin1String("OnBattery");
-    QDBusConnection::systemBus().callWithCallback(msg, this, SLOT(onBatteryReply(QDBusMessage)), nullptr);
+    QDBusConnection::sessionBus().callWithCallback(msg, this, SLOT(onBatteryReply(QDBusMessage)), nullptr);

     connect(device.as<Solid::Battery>(), &Solid::Battery::chargePercentChanged, this, &Battery::changed);
     connect(device.as<Solid::Battery>(), &Solid::Battery::chargeStateChanged, this, &Battery::changed);