diff --git a/homeassistant/components/august/entity.py b/homeassistant/components/august/entity.py
index 03c7698770c..a3f72da44be 100644
--- a/homeassistant/components/august/entity.py
+++ b/homeassistant/components/august/entity.py
@@ -18,7 +18,6 @@ class AugustEntityMixin(Entity):
         super().__init__()
         self._data = data
         self._device = device
-        self._undo_dispatch_subscription = None
 
     @property
     def should_poll(self):
diff --git a/homeassistant/components/august/manifest.json b/homeassistant/components/august/manifest.json
index 523cb5a361f..ef1df806575 100644
--- a/homeassistant/components/august/manifest.json
+++ b/homeassistant/components/august/manifest.json
@@ -3,7 +3,7 @@
   "name": "August",
   "documentation": "https://www.home-assistant.io/integrations/august",
   "requirements": [
-    "py-august==0.21.0"
+    "py-august==0.22.0"
   ],
   "dependencies": [
     "configurator"
diff --git a/homeassistant/components/august/sensor.py b/homeassistant/components/august/sensor.py
index 8c5682b8e42..6e8571c343a 100644
--- a/homeassistant/components/august/sensor.py
+++ b/homeassistant/components/august/sensor.py
@@ -9,10 +9,6 @@ from homeassistant.helpers.entity import Entity
 from .const import DATA_AUGUST, DOMAIN
 from .entity import AugustEntityMixin
 
-BATTERY_LEVEL_FULL = "Full"
-BATTERY_LEVEL_MEDIUM = "Medium"
-BATTERY_LEVEL_LOW = "Low"
-
 _LOGGER = logging.getLogger(__name__)
 
 
@@ -26,16 +22,7 @@ def _retrieve_linked_keypad_battery_state(detail):
     if detail.keypad is None:
         return None
 
-    battery_level = detail.keypad.battery_level
-
-    if battery_level == BATTERY_LEVEL_FULL:
-        return 100
-    if battery_level == BATTERY_LEVEL_MEDIUM:
-        return 60
-    if battery_level == BATTERY_LEVEL_LOW:
-        return 10
-
-    return 0
+    return detail.keypad.battery_percentage
 
 
 SENSOR_TYPES_BATTERY = {
diff --git a/requirements_all.txt b/requirements_all.txt
index 7304a9ccb77..5c96ae181b4 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1079,7 +1079,7 @@ pushover_complete==1.1.1
 pwmled==1.5.0
 
 # homeassistant.components.august
-py-august==0.21.0
+py-august==0.22.0
 
 # homeassistant.components.canary
 py-canary==0.5.0
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index de43f8f9d21..b9b035610e8 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -391,7 +391,7 @@ pure-python-adb==0.2.2.dev0
 pushbullet.py==0.11.0
 
 # homeassistant.components.august
-py-august==0.21.0
+py-august==0.22.0
 
 # homeassistant.components.canary
 py-canary==0.5.0
diff --git a/tests/components/august/test_sensor.py b/tests/components/august/test_sensor.py
index a0c1a2ea7bb..dfcae6dd362 100644
--- a/tests/components/august/test_sensor.py
+++ b/tests/components/august/test_sensor.py
@@ -82,3 +82,42 @@ async def test_create_lock_with_linked_keypad(hass):
     )
     assert entry
     assert entry.unique_id == "A6697750D607098BAE8D6BAA11EF8063_linked_keypad_battery"
+
+
+async def test_create_lock_with_low_battery_linked_keypad(hass):
+    """Test creation of a lock with a linked keypad that both have a battery."""
+    lock_one = await _mock_lock_from_fixture(hass, "get_lock.low_keypad_battery.json")
+    await _create_august_with_devices(hass, [lock_one])
+    entity_registry = await hass.helpers.entity_registry.async_get_registry()
+
+    sensor_a6697750d607098bae8d6baa11ef8063_name_battery = hass.states.get(
+        "sensor.a6697750d607098bae8d6baa11ef8063_name_battery"
+    )
+    assert sensor_a6697750d607098bae8d6baa11ef8063_name_battery.state == "88"
+    assert (
+        sensor_a6697750d607098bae8d6baa11ef8063_name_battery.attributes[
+            "unit_of_measurement"
+        ]
+        == "%"
+    )
+    entry = entity_registry.async_get(
+        "sensor.a6697750d607098bae8d6baa11ef8063_name_battery"
+    )
+    assert entry
+    assert entry.unique_id == "A6697750D607098BAE8D6BAA11EF8063_device_battery"
+
+    sensor_a6697750d607098bae8d6baa11ef8063_name_keypad_battery = hass.states.get(
+        "sensor.a6697750d607098bae8d6baa11ef8063_name_keypad_battery"
+    )
+    assert sensor_a6697750d607098bae8d6baa11ef8063_name_keypad_battery.state == "10"
+    assert (
+        sensor_a6697750d607098bae8d6baa11ef8063_name_keypad_battery.attributes[
+            "unit_of_measurement"
+        ]
+        == "%"
+    )
+    entry = entity_registry.async_get(
+        "sensor.a6697750d607098bae8d6baa11ef8063_name_keypad_battery"
+    )
+    assert entry
+    assert entry.unique_id == "A6697750D607098BAE8D6BAA11EF8063_linked_keypad_battery"
diff --git a/tests/fixtures/august/get_lock.low_keypad_battery.json b/tests/fixtures/august/get_lock.low_keypad_battery.json
new file mode 100644
index 00000000000..f848a8d30eb
--- /dev/null
+++ b/tests/fixtures/august/get_lock.low_keypad_battery.json
@@ -0,0 +1,103 @@
+{
+  "LockName": "Front Door Lock",
+  "Type": 2,
+  "Created": "2017-12-10T03:12:09.210Z",
+  "Updated": "2017-12-10T03:12:09.210Z",
+  "LockID": "A6697750D607098BAE8D6BAA11EF8063",
+  "HouseID": "000000000000",
+  "HouseName": "My House",
+  "Calibrated": false,
+  "skuNumber": "AUG-SL02-M02-S02",
+  "timeZone": "America/Vancouver",
+  "battery": 0.88,
+  "SerialNumber": "X2FSW05DGA",
+  "LockStatus": {
+    "status": "locked",
+    "doorState": "closed",
+    "dateTime": "2017-12-10T04:48:30.272Z",
+    "isLockStatusChanged": true,
+    "valid": true
+  },
+  "currentFirmwareVersion": "109717e9-3.0.44-3.0.30",
+  "homeKitEnabled": false,
+  "zWaveEnabled": false,
+  "isGalileo": false,
+  "Bridge": {
+    "_id": "aaacab87f7efxa0015884999",
+    "mfgBridgeID": "AAGPP102XX",
+    "deviceModel": "august-doorbell",
+    "firmwareVersion": "2.3.0-RC153+201711151527",
+    "operative": true
+  },
+  "keypad": {
+    "_id": "5bc65c24e6ef2a263e1450a8",
+    "serialNumber": "K1GXB0054Z",
+    "lockID": "92412D1B44004595B5DEB134E151A8D3",
+    "currentFirmwareVersion": "2.27.0",
+    "battery": {},
+    "batteryLevel": "Low",
+    "batteryRaw": 170
+  },
+  "OfflineKeys": {
+    "created": [],
+    "loaded": [
+      {
+        "UserID": "cccca94e-373e-aaaa-bbbb-333396827777",
+        "slot": 1,
+        "key": "kkk01d4300c1dcxxx1c330f794941111",
+        "created": "2017-12-10T03:12:09.215Z",
+        "loaded": "2017-12-10T03:12:54.391Z"
+      }
+    ],
+    "deleted": [],
+    "loadedhk": [
+      {
+        "key": "kkk01d4300c1dcxxx1c330f794941222",
+        "slot": 256,
+        "UserID": "cccca94e-373e-aaaa-bbbb-333396827777",
+        "created": "2017-12-10T03:12:09.218Z",
+        "loaded": "2017-12-10T03:12:55.563Z"
+      }
+    ]
+  },
+  "parametersToSet": {},
+  "users": {
+    "cccca94e-373e-aaaa-bbbb-333396827777": {
+      "UserType": "superuser",
+      "FirstName": "Foo",
+      "LastName": "Bar",
+      "identifiers": [
+        "email:foo@bar.com",
+        "phone:+177777777777"
+      ],
+      "imageInfo": {
+        "original": {
+          "width": 948,
+          "height": 949,
+          "format": "jpg",
+          "url": "http://www.image.com/foo.jpeg",
+          "secure_url": "https://www.image.com/foo.jpeg"
+        },
+        "thumbnail": {
+          "width": 128,
+          "height": 128,
+          "format": "jpg",
+          "url": "http://www.image.com/foo.jpeg",
+          "secure_url": "https://www.image.com/foo.jpeg"
+        }
+      }
+    }
+  },
+  "pubsubChannel": "3333a674-ffff-aaaa-b351-b3a4473f3333",
+  "ruleHash": {},
+  "cameras": [],
+  "geofenceLimits": {
+    "ios": {
+      "debounceInterval": 90,
+      "gpsAccuracyMultiplier": 2.5,
+      "maximumGeofence": 5000,
+      "minimumGeofence": 100,
+      "minGPSAccuracyRequired": 80
+    }
+  }
+}