diff --git a/homeassistant/components/flume/binary_sensor.py b/homeassistant/components/flume/binary_sensor.py
index 453e259bf46..c912c3419d7 100644
--- a/homeassistant/components/flume/binary_sensor.py
+++ b/homeassistant/components/flume/binary_sensor.py
@@ -25,6 +25,7 @@ from .const import (
     KEY_DEVICE_TYPE,
     NOTIFICATION_HIGH_FLOW,
     NOTIFICATION_LEAK_DETECTED,
+    NOTIFICATION_LOW_BATTERY,
 )
 from .coordinator import (
     FlumeDeviceConnectionUpdateCoordinator,
@@ -67,6 +68,12 @@ FLUME_BINARY_NOTIFICATION_SENSORS: tuple[FlumeBinarySensorEntityDescription, ...
         event_rule=NOTIFICATION_HIGH_FLOW,
         icon="mdi:waves",
     ),
+    FlumeBinarySensorEntityDescription(
+        key="low_battery",
+        entity_category=EntityCategory.DIAGNOSTIC,
+        device_class=BinarySensorDeviceClass.BATTERY,
+        event_rule=NOTIFICATION_LOW_BATTERY,
+    ),
 )
 
 
diff --git a/homeassistant/components/flume/const.py b/homeassistant/components/flume/const.py
index 1889cca8fa5..9e932cce4dd 100644
--- a/homeassistant/components/flume/const.py
+++ b/homeassistant/components/flume/const.py
@@ -47,3 +47,4 @@ NOTIFICATION_BRIDGE_DISCONNECT = "Bridge Disconnection"
 BRIDGE_NOTIFICATION_KEY = "connected"
 BRIDGE_NOTIFICATION_RULE = "Bridge Disconnection"
 NOTIFICATION_LEAK_DETECTED = "Flume Smart Leak Alert"
+NOTIFICATION_LOW_BATTERY = "Low Battery"