diff --git a/MqttTopics.h b/MqttTopics.h
index ee80b27..baac76f 100644
--- a/MqttTopics.h
+++ b/MqttTopics.h
@@ -7,6 +7,7 @@
 #define mqtt_topic_battery_drain "/battery/drain"
 #define mqtt_topic_battery_max_turn_current "/battery/maxTurnCurrent"
 #define mqtt_topic_battery_lock_distance "/battery/lockDistance"
+#define mqtt_topic_battery_keypad_critical "/battery/keypadCritical"
 
 #define mqtt_topic_lock_state "/lock/state"
 #define mqtt_topic_lock_binary_state "/lock/binaryState"
diff --git a/NetworkLock.cpp b/NetworkLock.cpp
index 252224d..f273668 100644
--- a/NetworkLock.cpp
+++ b/NetworkLock.cpp
@@ -202,6 +202,17 @@ void NetworkLock::publishKeyTurnerState(const NukiLock::KeyTurnerState& keyTurne
         publishInt(mqtt_topic_battery_level, level);
     }
 
+    if(_firstTunerStatePublish || keyTurnerState.accessoryBatteryState != lastKeyTurnerState.accessoryBatteryState)
+    {
+        if ((keyTurnerState.accessoryBatteryState & (1 << 7)) != 0) {
+            publishBool(mqtt_topic_battery_keypad_critical, (keyTurnerState.accessoryBatteryState & (1 << 6)) != 0);
+        }
+        else
+        {
+            publishBool(mqtt_topic_battery_keypad_critical, false);
+        }
+    }
+
     _firstTunerStatePublish = false;
 }