diff --git a/homeassistant/components/fritzbox/sensor.py b/homeassistant/components/fritzbox/sensor.py
index bed7004bd6a..801a3a67a6e 100644
--- a/homeassistant/components/fritzbox/sensor.py
+++ b/homeassistant/components/fritzbox/sensor.py
@@ -137,6 +137,7 @@ SENSOR_TYPES: Final[tuple[FritzSensorEntityDescription, ...]] = (
         key="battery",
         native_unit_of_measurement=PERCENTAGE,
         device_class=SensorDeviceClass.BATTERY,
+        state_class=SensorStateClass.MEASUREMENT,
         entity_category=EntityCategory.DIAGNOSTIC,
         suitable=lambda device: device.battery_level is not None,
         native_value=lambda device: device.battery_level,
diff --git a/tests/components/fritzbox/test_binary_sensor.py b/tests/components/fritzbox/test_binary_sensor.py
index 594ed14a7d1..d5b0b5d196b 100644
--- a/tests/components/fritzbox/test_binary_sensor.py
+++ b/tests/components/fritzbox/test_binary_sensor.py
@@ -11,7 +11,11 @@ from homeassistant.components.binary_sensor import (
     BinarySensorDeviceClass,
 )
 from homeassistant.components.fritzbox.const import DOMAIN as FB_DOMAIN
-from homeassistant.components.sensor import ATTR_STATE_CLASS, DOMAIN as SENSOR_DOMAIN
+from homeassistant.components.sensor import (
+    ATTR_STATE_CLASS,
+    DOMAIN as SENSOR_DOMAIN,
+    SensorStateClass,
+)
 from homeassistant.const import (
     ATTR_DEVICE_CLASS,
     ATTR_FRIENDLY_NAME,
@@ -71,7 +75,7 @@ async def test_setup(hass: HomeAssistant, fritz: Mock) -> None:
     assert state.state == "23"
     assert state.attributes[ATTR_FRIENDLY_NAME] == f"{CONF_FAKE_NAME} Battery"
     assert state.attributes[ATTR_UNIT_OF_MEASUREMENT] == PERCENTAGE
-    assert ATTR_STATE_CLASS not in state.attributes
+    assert state.attributes[ATTR_STATE_CLASS] is SensorStateClass.MEASUREMENT
 
 
 async def test_is_off(hass: HomeAssistant, fritz: Mock) -> None:
diff --git a/tests/components/fritzbox/test_climate.py b/tests/components/fritzbox/test_climate.py
index 7766d906f68..699a2b8c53e 100644
--- a/tests/components/fritzbox/test_climate.py
+++ b/tests/components/fritzbox/test_climate.py
@@ -37,7 +37,11 @@ from homeassistant.components.fritzbox.const import (
     ATTR_STATE_WINDOW_OPEN,
     DOMAIN as FB_DOMAIN,
 )
-from homeassistant.components.sensor import ATTR_STATE_CLASS, DOMAIN as SENSOR_DOMAIN
+from homeassistant.components.sensor import (
+    ATTR_STATE_CLASS,
+    DOMAIN as SENSOR_DOMAIN,
+    SensorStateClass,
+)
 from homeassistant.const import (
     ATTR_BATTERY_LEVEL,
     ATTR_ENTITY_ID,
@@ -99,7 +103,7 @@ async def test_setup(hass: HomeAssistant, fritz: Mock) -> None:
     assert state.state == "23"
     assert state.attributes[ATTR_FRIENDLY_NAME] == f"{CONF_FAKE_NAME} Battery"
     assert state.attributes[ATTR_UNIT_OF_MEASUREMENT] == PERCENTAGE
-    assert ATTR_STATE_CLASS not in state.attributes
+    assert state.attributes[ATTR_STATE_CLASS] is SensorStateClass.MEASUREMENT
 
     state = hass.states.get(f"{SENSOR_DOMAIN}.{CONF_FAKE_NAME}_comfort_temperature")
     assert state
diff --git a/tests/components/fritzbox/test_sensor.py b/tests/components/fritzbox/test_sensor.py
index 67b2c3e8ab6..cb136eee993 100644
--- a/tests/components/fritzbox/test_sensor.py
+++ b/tests/components/fritzbox/test_sensor.py
@@ -71,7 +71,7 @@ async def test_setup(
             "23",
             f"{CONF_FAKE_NAME} Battery",
             PERCENTAGE,
-            None,
+            SensorStateClass.MEASUREMENT,
             EntityCategory.DIAGNOSTIC,
         ],
     )