diff -ruN 1/panel-plugin/battery.c 2/panel-plugin/battery.c
--- 1/panel-plugin/battery.c    2016-10-29 08:37:38.000000000 +0200
+++ 2/panel-plugin/battery.c    2016-12-26 21:54:06.000000000 +0100
@@ -615,6 +615,7 @@
         GTK_STYLE_PROVIDER (css_provider),
         GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
     g_free(css);
+    g_object_unref (css_provider);
 #else
     gtk_widget_override_background_color (widget, GTK_STATE_FLAG_NORMAL, color);
 #endif