Fix Acaia battery sensor going unavailable on first-session disconnect (#169420)

Co-authored-by: Josef Zweck <josef@zweck.dev>

homeassistant/components/acaia/sensor.py

@@ -143,4 +143,4 @@ class AcaiaRestoreSensor(AcaiaEntity, RestoreSensor):
     @property
     def available(self) -> bool:
         """Return True if entity is available."""
-        return super().available or self._restored_data is not None
+        return super().available or self.native_value is not None

tests/components/acaia/test_sensor.py

@@ -1,7 +1,9 @@
 """Test sensors for acaia integration."""
 
+from datetime import timedelta
 from unittest.mock import MagicMock, patch
 
+from freezegun.api import FrozenDateTimeFactory
 from syrupy.assertion import SnapshotAssertion
 
 from homeassistant.const import PERCENTAGE, Platform
@@ -12,6 +14,7 @@ from . import setup_integration
 
 from tests.common import (
     MockConfigEntry,
+    async_fire_time_changed,
     mock_restore_cache_with_extra_data,
     snapshot_platform,
 )
@@ -61,3 +64,28 @@ async def test_restore_state(
     state = hass.states.get(entity_id)
     assert state
     assert state.state == "65"
+
+
+async def test_battery_available_within_session_after_disconnect(
+    hass: HomeAssistant,
+    mock_scale: MagicMock,
+    freezer: FrozenDateTimeFactory,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test battery stays available on disconnect when no restore data exists."""
+    entity_id = "sensor.lunar_ddeeff_battery"
+
+    await setup_integration(hass, mock_config_entry)
+
+    state = hass.states.get(entity_id)
+    assert state
+    assert state.state == "42"
+
+    mock_scale.connected = False
+    freezer.tick(timedelta(minutes=10))
+    async_fire_time_changed(hass)
+    await hass.async_block_till_done()
+
+    state = hass.states.get(entity_id)
+    assert state
+    assert state.state == "42"