diff --git a/tuhigui/drawingperspective.py b/tuhigui/drawingperspective.py
index 3093397..eb71f94 100644
--- a/tuhigui/drawingperspective.py
+++ b/tuhigui/drawingperspective.py
@@ -168,6 +168,9 @@ class DrawingPerspective(Gtk.Stack):
 
         if device.battery_state == 1:
             state = '-charging'
+        elif device.battery_state == 0:  # unknown
+            fill = 'missing'
+            state = ''
         else:
             state = ''
         batt_icon_name = f'battery-{fill}{state}-symbolic'