diff --git a/homeassistant/components/elgato/__init__.py b/homeassistant/components/elgato/__init__.py
index 4345203d4bd..770e6f13f9a 100644
--- a/homeassistant/components/elgato/__init__.py
+++ b/homeassistant/components/elgato/__init__.py
@@ -6,7 +6,7 @@ from homeassistant.core import HomeAssistant
 from .const import DOMAIN
 from .coordinator import ElgatoDataUpdateCoordinator
 
-PLATFORMS = [Platform.BUTTON, Platform.LIGHT]
+PLATFORMS = [Platform.BUTTON, Platform.LIGHT, Platform.SENSOR]
 
 
 async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
diff --git a/homeassistant/components/elgato/coordinator.py b/homeassistant/components/elgato/coordinator.py
index 143eba69f20..0dda6bad292 100644
--- a/homeassistant/components/elgato/coordinator.py
+++ b/homeassistant/components/elgato/coordinator.py
@@ -1,7 +1,7 @@
 """DataUpdateCoordinator for Elgato."""
 from dataclasses import dataclass
 
-from elgato import Elgato, ElgatoConnectionError, Info, Settings, State
+from elgato import BatteryInfo, Elgato, ElgatoConnectionError, Info, Settings, State
 
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import CONF_HOST, CONF_PORT
@@ -16,6 +16,7 @@ from .const import DOMAIN, LOGGER, SCAN_INTERVAL
 class ElgatoData:
     """Elgato data stored in the DataUpdateCoordinator."""
 
+    battery: BatteryInfo | None
     info: Info
     settings: Settings
     state: State
@@ -25,6 +26,7 @@ class ElgatoDataUpdateCoordinator(DataUpdateCoordinator[ElgatoData]):
     """Class to manage fetching Elgato data."""
 
     config_entry: ConfigEntry
+    has_battery: bool | None = None
 
     def __init__(self, hass: HomeAssistant, entry: ConfigEntry) -> None:
         """Initialize the coordinator."""
@@ -44,7 +46,11 @@ class ElgatoDataUpdateCoordinator(DataUpdateCoordinator[ElgatoData]):
     async def _async_update_data(self) -> ElgatoData:
         """Fetch data from the Elgato device."""
         try:
+            if self.has_battery is None:
+                self.has_battery = await self.client.has_battery()
+
             return ElgatoData(
+                battery=await self.client.battery() if self.has_battery else None,
                 info=await self.client.info(),
                 settings=await self.client.settings(),
                 state=await self.client.state(),
diff --git a/homeassistant/components/elgato/sensor.py b/homeassistant/components/elgato/sensor.py
new file mode 100644
index 00000000000..6096a0b003d
--- /dev/null
+++ b/homeassistant/components/elgato/sensor.py
@@ -0,0 +1,94 @@
+"""Support for Elgato sensors."""
+from __future__ import annotations
+
+from collections.abc import Callable
+from dataclasses import dataclass
+
+from homeassistant.components.sensor import (
+    SensorDeviceClass,
+    SensorEntity,
+    SensorEntityDescription,
+    SensorStateClass,
+)
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import PERCENTAGE
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity import EntityCategory
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+
+from .const import DOMAIN
+from .coordinator import ElgatoData, ElgatoDataUpdateCoordinator
+from .entity import ElgatoEntity
+
+
+@dataclass
+class ElgatoEntityDescriptionMixin:
+    """Mixin values for Elgato entities."""
+
+    value_fn: Callable[[ElgatoData], float | int | None]
+
+
+@dataclass
+class ElgatoSensorEntityDescription(
+    SensorEntityDescription, ElgatoEntityDescriptionMixin
+):
+    """Class describing Elgato sensor entities."""
+
+    has_fn: Callable[[ElgatoData], bool] = lambda _: True
+
+
+SENSORS = [
+    ElgatoSensorEntityDescription(
+        key="battery",
+        name="Battery",
+        device_class=SensorDeviceClass.BATTERY,
+        entity_category=EntityCategory.DIAGNOSTIC,
+        native_unit_of_measurement=PERCENTAGE,
+        state_class=SensorStateClass.MEASUREMENT,
+        suggested_display_precision=0,
+        has_fn=lambda x: x.battery is not None,
+        value_fn=lambda x: x.battery.level if x.battery else None,
+    ),
+]
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up Elgato sensor based on a config entry."""
+    coordinator: ElgatoDataUpdateCoordinator = hass.data[DOMAIN][entry.entry_id]
+
+    async_add_entities(
+        ElgatoSensorEntity(
+            coordinator=coordinator,
+            description=description,
+        )
+        for description in SENSORS
+        if description.has_fn(coordinator.data)
+    )
+
+
+class ElgatoSensorEntity(ElgatoEntity, SensorEntity):
+    """Representation of a Elgato sensor."""
+
+    entity_description: ElgatoSensorEntityDescription
+
+    def __init__(
+        self,
+        coordinator: ElgatoDataUpdateCoordinator,
+        description: ElgatoSensorEntityDescription,
+    ) -> None:
+        """Initiate Elgato sensor."""
+        super().__init__(coordinator)
+
+        self.entity_description = description
+        self._attr_unique_id = (
+            f"{coordinator.data.info.serial_number}_{description.key}"
+        )
+
+    @property
+    def native_value(self) -> float | int | None:
+        """Return the sensor value."""
+        return self.entity_description.value_fn(self.coordinator.data)
diff --git a/tests/components/elgato/conftest.py b/tests/components/elgato/conftest.py
index fad3c04c10e..a32b3a70368 100644
--- a/tests/components/elgato/conftest.py
+++ b/tests/components/elgato/conftest.py
@@ -2,14 +2,14 @@
 from collections.abc import Generator
 from unittest.mock import AsyncMock, MagicMock, patch
 
-from elgato import Info, Settings, State
+from elgato import BatteryInfo, ElgatoNoBatteryError, Info, Settings, State
 import pytest
 
 from homeassistant.components.elgato.const import DOMAIN
 from homeassistant.const import CONF_HOST, CONF_MAC, CONF_PORT
 from homeassistant.core import HomeAssistant
 
-from tests.common import MockConfigEntry, load_fixture
+from tests.common import MockConfigEntry, get_fixture_path, load_fixture
 from tests.components.light.conftest import mock_light_profiles  # noqa: F401
 
 
@@ -90,6 +90,17 @@ def mock_elgato(
         elgato.settings.return_value = Settings.parse_raw(
             load_fixture(f"{device_fixtures}/settings.json", DOMAIN)
         )
+
+        # This may, or may not, be a battery-powered device
+        if get_fixture_path(f"{device_fixtures}/battery.json", DOMAIN).exists():
+            elgato.has_battery.return_value = True
+            elgato.battery.return_value = BatteryInfo.parse_raw(
+                load_fixture(f"{device_fixtures}/battery.json", DOMAIN)
+            )
+        else:
+            elgato.has_battery.return_value = False
+            elgato.battery.side_effect = ElgatoNoBatteryError
+
         yield elgato
 
 
diff --git a/tests/components/elgato/fixtures/key-light-mini/battery.json b/tests/components/elgato/fixtures/key-light-mini/battery.json
new file mode 100644
index 00000000000..65b10f3ca58
--- /dev/null
+++ b/tests/components/elgato/fixtures/key-light-mini/battery.json
@@ -0,0 +1,8 @@
+{
+  "powerSource": 1,
+  "level": 78.57,
+  "status": 2,
+  "currentBatteryVoltage": 3860,
+  "inputChargeVoltage": 4208,
+  "inputChargeCurrent": 3008
+}
diff --git a/tests/components/elgato/fixtures/key-light-mini/info.json b/tests/components/elgato/fixtures/key-light-mini/info.json
new file mode 100644
index 00000000000..3cd5e8a2134
--- /dev/null
+++ b/tests/components/elgato/fixtures/key-light-mini/info.json
@@ -0,0 +1,16 @@
+{
+  "productName": "Elgato Key Light Mini",
+  "hardwareBoardType": 202,
+  "hardwareRevision": 0.1,
+  "macAddress": "11:22:33:44:55:66",
+  "firmwareBuildNumber": 229,
+  "firmwareVersion": "1.0.4",
+  "serialNumber": "GW24L1A02987",
+  "displayName": "Frenck",
+  "features": ["lights"],
+  "wifi-info": {
+    "ssid": "Frenck-IoT",
+    "frequencyMHz": 2400,
+    "rssi": -41
+  }
+}
diff --git a/tests/components/elgato/fixtures/key-light-mini/settings.json b/tests/components/elgato/fixtures/key-light-mini/settings.json
new file mode 100644
index 00000000000..38052f62cd9
--- /dev/null
+++ b/tests/components/elgato/fixtures/key-light-mini/settings.json
@@ -0,0 +1,20 @@
+{
+  "powerOnBehavior": 1,
+  "powerOnBrightness": 20,
+  "powerOnTemperature": 230,
+  "switchOnDurationMs": 100,
+  "switchOffDurationMs": 300,
+  "colorChangeDurationMs": 100,
+  "battery": {
+    "energySaving": {
+      "enable": 0,
+      "minimumBatteryLevel": 15.0,
+      "disableWifi": 0,
+      "adjustBrightness": {
+        "enable": 0,
+        "brightness": 10.0
+      }
+    },
+    "bypass": 0
+  }
+}
diff --git a/tests/components/elgato/fixtures/key-light-mini/state.json b/tests/components/elgato/fixtures/key-light-mini/state.json
new file mode 100644
index 00000000000..5b3d7690d85
--- /dev/null
+++ b/tests/components/elgato/fixtures/key-light-mini/state.json
@@ -0,0 +1,5 @@
+{
+  "on": 1,
+  "brightness": 21,
+  "temperature": 297
+}
diff --git a/tests/components/elgato/test_sensor.py b/tests/components/elgato/test_sensor.py
new file mode 100644
index 00000000000..b4bd1ab0818
--- /dev/null
+++ b/tests/components/elgato/test_sensor.py
@@ -0,0 +1,63 @@
+"""Tests for the Elgato sensor platform."""
+
+import pytest
+
+from homeassistant.components.elgato.const import DOMAIN
+from homeassistant.components.sensor import (
+    ATTR_STATE_CLASS,
+    SensorDeviceClass,
+    SensorStateClass,
+)
+from homeassistant.const import (
+    ATTR_DEVICE_CLASS,
+    ATTR_FRIENDLY_NAME,
+    ATTR_ICON,
+    ATTR_UNIT_OF_MEASUREMENT,
+    PERCENTAGE,
+)
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import device_registry as dr, entity_registry as er
+from homeassistant.helpers.entity import EntityCategory
+
+
+@pytest.mark.parametrize("device_fixtures", ["key-light-mini"])
+@pytest.mark.usefixtures(
+    "device_fixtures",
+    "entity_registry_enabled_by_default",
+    "init_integration",
+    "mock_elgato",
+)
+async def test_battery_sensor(hass: HomeAssistant) -> None:
+    """Test the Elgato battery sensor."""
+    device_registry = dr.async_get(hass)
+    entity_registry = er.async_get(hass)
+
+    state = hass.states.get("sensor.frenck_battery")
+    assert state
+    assert state.state == "78.57"
+    assert state.attributes.get(ATTR_DEVICE_CLASS) == SensorDeviceClass.BATTERY
+    assert state.attributes.get(ATTR_FRIENDLY_NAME) == "Frenck Battery"
+    assert state.attributes.get(ATTR_STATE_CLASS) is SensorStateClass.MEASUREMENT
+    assert state.attributes.get(ATTR_UNIT_OF_MEASUREMENT) == PERCENTAGE
+    assert not state.attributes.get(ATTR_ICON)
+
+    entry = entity_registry.async_get("sensor.frenck_battery")
+    assert entry
+    assert entry.unique_id == "GW24L1A02987_battery"
+    assert entry.entity_category == EntityCategory.DIAGNOSTIC
+    assert entry.options == {"sensor": {"suggested_display_precision": 0}}
+
+    assert entry.device_id
+    device_entry = device_registry.async_get(entry.device_id)
+    assert device_entry
+    assert device_entry.configuration_url is None
+    assert device_entry.connections == {
+        (dr.CONNECTION_NETWORK_MAC, "aa:bb:cc:dd:ee:ff")
+    }
+    assert device_entry.entry_type is None
+    assert device_entry.identifiers == {(DOMAIN, "GW24L1A02987")}
+    assert device_entry.manufacturer == "Elgato"
+    assert device_entry.model == "Elgato Key Light Mini"
+    assert device_entry.name == "Frenck"
+    assert device_entry.sw_version == "1.0.4 (229)"
+    assert device_entry.hw_version == "202"