diff --git a/homeassistant/components/rachio/binary_sensor.py b/homeassistant/components/rachio/binary_sensor.py
index eb7a84867ab..e6248b2c93b 100644
--- a/homeassistant/components/rachio/binary_sensor.py
+++ b/homeassistant/components/rachio/binary_sensor.py
@@ -2,6 +2,7 @@
 
 from abc import abstractmethod
 import logging
+from typing import Any
 
 from homeassistant.components.binary_sensor import (
     BinarySensorDeviceClass,
@@ -15,16 +16,21 @@ from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from .const import (
     DOMAIN as DOMAIN_RACHIO,
+    KEY_BATTERY_STATUS,
     KEY_DEVICE_ID,
+    KEY_LOW,
     KEY_RAIN_SENSOR_TRIPPED,
+    KEY_REPORTED_STATE,
+    KEY_STATE,
     KEY_STATUS,
     KEY_SUBTYPE,
     SIGNAL_RACHIO_CONTROLLER_UPDATE,
     SIGNAL_RACHIO_RAIN_SENSOR_UPDATE,
     STATUS_ONLINE,
 )
+from .coordinator import RachioUpdateCoordinator
 from .device import RachioPerson
-from .entity import RachioDevice
+from .entity import RachioDevice, RachioHoseTimerEntity
 from .webhooks import (
     SUBTYPE_COLD_REBOOT,
     SUBTYPE_OFFLINE,
@@ -52,6 +58,11 @@ def _create_entities(hass: HomeAssistant, config_entry: ConfigEntry) -> list[Ent
     for controller in person.controllers:
         entities.append(RachioControllerOnlineBinarySensor(controller))
         entities.append(RachioRainSensor(controller))
+    entities.extend(
+        RachioHoseTimerBattery(valve, base_station.coordinator)
+        for base_station in person.base_stations
+        for valve in base_station.coordinator.data.values()
+    )
     return entities
 
 
@@ -140,3 +151,24 @@ class RachioRainSensor(RachioControllerBinarySensor):
                 self._async_handle_any_update,
             )
         )
+
+
+class RachioHoseTimerBattery(RachioHoseTimerEntity, BinarySensorEntity):
+    """Represents a battery sensor for a smart hose timer."""
+
+    _attr_device_class = BinarySensorDeviceClass.BATTERY
+
+    def __init__(
+        self, data: dict[str, Any], coordinator: RachioUpdateCoordinator
+    ) -> None:
+        """Initialize a smart hose timer battery sensor."""
+        super().__init__(data, coordinator)
+        self._attr_unique_id = f"{self.id}-battery"
+
+    @callback
+    def _update_attr(self) -> None:
+        """Handle updated coordinator data."""
+        data = self.coordinator.data[self.id]
+
+        self._static_attrs = data[KEY_STATE][KEY_REPORTED_STATE]
+        self._attr_is_on = self._static_attrs[KEY_BATTERY_STATUS] == KEY_LOW
diff --git a/homeassistant/components/rachio/const.py b/homeassistant/components/rachio/const.py
index 22c92be2b74..b9b16c0cd87 100644
--- a/homeassistant/components/rachio/const.py
+++ b/homeassistant/components/rachio/const.py
@@ -57,6 +57,7 @@ KEY_CONNECTED = "connected"
 KEY_CURRENT_STATUS = "lastWateringAction"
 KEY_DETECT_FLOW = "detectFlow"
 KEY_BATTERY_STATUS = "batteryStatus"
+KEY_LOW = "LOW"
 KEY_REASON = "reason"
 KEY_DEFAULT_RUNTIME = "defaultRuntimeSeconds"
 KEY_DURATION_SECONDS = "durationSeconds"
diff --git a/homeassistant/components/rachio/entity.py b/homeassistant/components/rachio/entity.py
index 27564f1caca..056abe9145b 100644
--- a/homeassistant/components/rachio/entity.py
+++ b/homeassistant/components/rachio/entity.py
@@ -70,6 +70,7 @@ class RachioHoseTimerEntity(CoordinatorEntity[RachioUpdateCoordinator]):
             manufacturer=DEFAULT_NAME,
             configuration_url="https://app.rach.io",
         )
+        self._update_attr()
 
     @property
     def available(self) -> bool:
diff --git a/homeassistant/components/rachio/switch.py b/homeassistant/components/rachio/switch.py
index 0f696baad3a..1a8dbe42904 100644
--- a/homeassistant/components/rachio/switch.py
+++ b/homeassistant/components/rachio/switch.py
@@ -548,8 +548,6 @@ class RachioValve(RachioHoseTimerEntity, SwitchEntity):
         self._person = person
         self._base = base
         self._attr_unique_id = f"{self.id}-valve"
-        self._static_attrs = data[KEY_STATE][KEY_REPORTED_STATE]
-        self._attr_is_on = KEY_CURRENT_STATUS in self._static_attrs
 
     def turn_on(self, **kwargs: Any) -> None:
         """Turn on this valve."""