diff --git a/homeassistant/components/shelly/__init__.py b/homeassistant/components/shelly/__init__.py
index 133031a54fe..02ebbdc530f 100644
--- a/homeassistant/components/shelly/__init__.py
+++ b/homeassistant/components/shelly/__init__.py
@@ -39,6 +39,7 @@ from homeassistant.helpers.typing import ConfigType
 from .const import (
     BLOCK_EXPECTED_SLEEP_PERIOD,
     BLOCK_WRONG_SLEEP_PERIOD,
+    CONF_BLE_SCANNER_MODE,
     CONF_COAP_PORT,
     CONF_SLEEP_PERIOD,
     DOMAIN,
@@ -46,6 +47,7 @@ from .const import (
     LOGGER,
     MODELS_WITH_WRONG_SLEEP_PERIOD,
     PUSH_UPDATE_ISSUE_ID,
+    BLEScannerMode,
 )
 from .coordinator import (
     ShellyBlockCoordinator,
@@ -125,6 +127,21 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     return True
 
 
+async def async_migrate_entry(hass: HomeAssistant, entry: ShellyConfigEntry) -> bool:
+    """Migrate old config entries."""
+    if entry.version > 1 or (entry.version == 1 and entry.minor_version > 3):
+        return False
+    if entry.minor_version < 3:
+        # One-time flip of explicit Active scanning to Auto so existing
+        # installs get the new battery-friendly default; Passive stays
+        # Passive because users picked it deliberately.
+        options = dict(entry.options)
+        if options.get(CONF_BLE_SCANNER_MODE) == BLEScannerMode.ACTIVE:
+            options[CONF_BLE_SCANNER_MODE] = BLEScannerMode.AUTO
+        hass.config_entries.async_update_entry(entry, options=options, minor_version=3)
+    return True
+
+
 async def async_setup_entry(hass: HomeAssistant, entry: ShellyConfigEntry) -> bool:
     """Set up Shelly from a config entry."""
     entry.runtime_data = ShellyEntryData([])
diff --git a/homeassistant/components/shelly/bluetooth/__init__.py b/homeassistant/components/shelly/bluetooth/__init__.py
index 87461fd4901..7d44dd7c646 100644
--- a/homeassistant/components/shelly/bluetooth/__init__.py
+++ b/homeassistant/components/shelly/bluetooth/__init__.py
@@ -19,6 +19,7 @@ if TYPE_CHECKING:
 BLE_SCANNER_MODE_TO_BLUETOOTH_SCANNING_MODE = {
     BLEScannerMode.PASSIVE: BluetoothScanningMode.PASSIVE,
     BLEScannerMode.ACTIVE: BluetoothScanningMode.ACTIVE,
+    BLEScannerMode.AUTO: BluetoothScanningMode.AUTO,
 }
 
 
@@ -31,13 +32,25 @@ async def async_connect_scanner(
     """Connect scanner."""
     device = coordinator.device
     entry = coordinator.config_entry
-    bluetooth_scanning_mode = BLE_SCANNER_MODE_TO_BLUETOOTH_SCANNING_MODE[scanner_mode]
+    # Options persist as plain strings, coerce so `is` checks work.
+    scanner_mode = BLEScannerMode(scanner_mode)
+    requested_mode = BLE_SCANNER_MODE_TO_BLUETOOTH_SCANNING_MODE[scanner_mode]
+    # AUTO runs the radio passive and lets habluetooth's auto-scheduler
+    # flip the BLE script to active on demand.
+    firmware_active = scanner_mode is BLEScannerMode.ACTIVE
+    current_mode = (
+        BluetoothScanningMode.ACTIVE
+        if firmware_active
+        else BluetoothScanningMode.PASSIVE
+    )
     scanner = create_scanner(
         coordinator.bluetooth_source,
         entry.title,
-        requested_mode=bluetooth_scanning_mode,
-        current_mode=bluetooth_scanning_mode,
+        requested_mode=requested_mode,
+        current_mode=current_mode,
     )
+    if scanner_mode is BLEScannerMode.AUTO:
+        scanner.set_active_window_provider(device)
     unload_callbacks = [
         async_register_scanner(
             hass,
@@ -52,7 +65,7 @@ async def async_connect_scanner(
     ]
     await async_start_scanner(
         device=device,
-        active=scanner_mode == BLEScannerMode.ACTIVE,
+        active=firmware_active,
         event_type=BLE_SCAN_RESULT_EVENT,
         data_version=BLE_SCAN_RESULT_VERSION,
     )
diff --git a/homeassistant/components/shelly/config_flow.py b/homeassistant/components/shelly/config_flow.py
index d81e6926f48..eb01a1a25ce 100644
--- a/homeassistant/components/shelly/config_flow.py
+++ b/homeassistant/components/shelly/config_flow.py
@@ -103,6 +103,7 @@ CONFIG_SCHEMA: Final = vol.Schema(
 
 BLE_SCANNER_OPTIONS = [
     BLEScannerMode.DISABLED,
+    BLEScannerMode.AUTO,
     BLEScannerMode.ACTIVE,
     BLEScannerMode.PASSIVE,
 ]
@@ -205,7 +206,7 @@ class ShellyConfigFlow(ConfigFlow, domain=DOMAIN):
     """Handle a config flow for Shelly."""
 
     VERSION = 1
-    MINOR_VERSION = 2
+    MINOR_VERSION = 3
 
     host: str = ""
     port: int = DEFAULT_HTTP_PORT
diff --git a/homeassistant/components/shelly/const.py b/homeassistant/components/shelly/const.py
index f12ca9271fd..6900bcfb16f 100644
--- a/homeassistant/components/shelly/const.py
+++ b/homeassistant/components/shelly/const.py
@@ -237,6 +237,7 @@ class BLEScannerMode(StrEnum):
     DISABLED = "disabled"
     ACTIVE = "active"
     PASSIVE = "passive"
+    AUTO = "auto"
 
 
 BLE_SCANNER_MIN_FIRMWARE = "1.5.1"
diff --git a/homeassistant/components/shelly/repairs.py b/homeassistant/components/shelly/repairs.py
index 02998088bef..7e3161ebde5 100644
--- a/homeassistant/components/shelly/repairs.py
+++ b/homeassistant/components/shelly/repairs.py
@@ -53,10 +53,9 @@ def async_manage_ble_scanner_firmware_unsupported_issue(
 
     if supports_scripts and device.model not in (MODEL_PLUG_S_G3, MODEL_OUT_PLUG_S_G3):
         firmware = AwesomeVersion(device.shelly["ver"])
-        if (
-            firmware < BLE_SCANNER_MIN_FIRMWARE
-            and entry.options.get(CONF_BLE_SCANNER_MODE) == BLEScannerMode.ACTIVE
-        ):
+        if firmware < BLE_SCANNER_MIN_FIRMWARE and entry.options.get(
+            CONF_BLE_SCANNER_MODE
+        ) in (BLEScannerMode.ACTIVE, BLEScannerMode.AUTO):
             ir.async_create_issue(
                 hass,
                 DOMAIN,
diff --git a/homeassistant/components/shelly/strings.json b/homeassistant/components/shelly/strings.json
index fdbcda0ce58..bad550bfd3d 100644
--- a/homeassistant/components/shelly/strings.json
+++ b/homeassistant/components/shelly/strings.json
@@ -685,7 +685,7 @@
         },
         "step": {
           "confirm": {
-            "description": "Your Shelly device {device_name} with IP address {ip_address} is running firmware {firmware} and acts as BLE scanner with active mode. This firmware version is not supported for BLE scanner active mode.\n\nSelect **Submit** button to start the OTA update to the latest stable firmware version.",
+            "description": "Your Shelly device {device_name} with IP address {ip_address} is running firmware {firmware} and acts as a BLE scanner in Active or Auto mode. This firmware version is not supported for these BLE scanner modes.\n\nSelect **Submit** button to start the OTA update to the latest stable firmware version.",
             "title": "[%key:component::shelly::issues::ble_scanner_firmware_unsupported::title%]"
           }
         }
@@ -787,16 +787,17 @@
         "data_description": {
           "ble_scanner_mode": "The scanner mode to use for Bluetooth scanning."
         },
-        "description": "Bluetooth scanning can be active or passive. With active, the Shelly requests data from nearby devices; with passive, the Shelly receives unsolicited data from nearby devices."
+        "description": "Auto is recommended for most setups; the Shelly listens passively and only briefly switches to active when needed, saving battery on your Bluetooth devices."
       }
     }
   },
   "selector": {
     "ble_scanner_mode": {
       "options": {
-        "active": "[%key:common::state::active%]",
+        "active": "Active (uses more device battery, fastest updates)",
+        "auto": "Auto (recommended, saves device battery)",
         "disabled": "[%key:common::state::disabled%]",
-        "passive": "Passive"
+        "passive": "Passive (lowest device battery use, some details may be missing)"
       }
     },
     "device": {
diff --git a/tests/components/shelly/__init__.py b/tests/components/shelly/__init__.py
index 72464a7894b..2d588d01825 100644
--- a/tests/components/shelly/__init__.py
+++ b/tests/components/shelly/__init__.py
@@ -61,7 +61,12 @@ async def init_integration(
         data[CONF_GEN] = gen
 
     entry = MockConfigEntry(
-        domain=DOMAIN, data=data, unique_id=MOCK_MAC, options=options, title="Test name"
+        domain=DOMAIN,
+        data=data,
+        unique_id=MOCK_MAC,
+        options=options,
+        title="Test name",
+        minor_version=3,
     )
     entry.add_to_hass(hass)
 
diff --git a/tests/components/shelly/bluetooth/test_scanner.py b/tests/components/shelly/bluetooth/test_scanner.py
index 26ddf9a50ba..3e615961d47 100644
--- a/tests/components/shelly/bluetooth/test_scanner.py
+++ b/tests/components/shelly/bluetooth/test_scanner.py
@@ -1,9 +1,13 @@
 """Test the shelly bluetooth scanner."""
 
+from unittest.mock import Mock, patch
+
+from aioshelly.ble.backend.scanner import ShellyBLEScanner
 from aioshelly.ble.const import BLE_SCAN_RESULT_EVENT
 import pytest
 
 from homeassistant.components import bluetooth
+from homeassistant.components.bluetooth import BluetoothScanningMode
 from homeassistant.components.shelly.const import CONF_BLE_SCANNER_MODE, BLEScannerMode
 from homeassistant.core import HomeAssistant
 
@@ -186,3 +190,19 @@ async def test_scanner_warns_on_corrupt_event(
         },
     )
     assert "Failed to parse BLE event" in caplog.text
+
+
+async def test_scanner_auto_mode_starts_passive_and_binds_provider(
+    hass: HomeAssistant, mock_rpc_device: Mock
+) -> None:
+    """AUTO runs the radio passive; the scanner is pinned AUTO so the worker spawns."""
+    with patch.object(
+        ShellyBLEScanner, "set_active_window_provider", autospec=True
+    ) as mock_set_provider:
+        await init_integration(hass, 2, options={CONF_BLE_SCANNER_MODE: "auto"})
+    assert mock_rpc_device.initialized is True
+    scanner = bluetooth.async_scanner_by_source(hass, "12:34:56:78:9A:BE")
+    assert scanner is not None
+    assert scanner.requested_mode is BluetoothScanningMode.AUTO
+    assert scanner.current_mode is BluetoothScanningMode.PASSIVE
+    mock_set_provider.assert_called_once_with(scanner, mock_rpc_device)
diff --git a/tests/components/shelly/test_config_flow.py b/tests/components/shelly/test_config_flow.py
index 0e86ae18f96..0c2df8646db 100644
--- a/tests/components/shelly/test_config_flow.py
+++ b/tests/components/shelly/test_config_flow.py
@@ -2658,6 +2658,21 @@ async def test_options_flow_ble(hass: HomeAssistant, mock_rpc_device: Mock) -> N
     assert result["type"] is FlowResultType.CREATE_ENTRY
     assert result["data"][CONF_BLE_SCANNER_MODE] is BLEScannerMode.PASSIVE
 
+    result = await hass.config_entries.options.async_init(entry.entry_id)
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "init"
+    assert result["errors"] is None
+
+    result = await hass.config_entries.options.async_configure(
+        result["flow_id"],
+        user_input={
+            CONF_BLE_SCANNER_MODE: BLEScannerMode.AUTO,
+        },
+    )
+
+    assert result["type"] is FlowResultType.CREATE_ENTRY
+    assert result["data"][CONF_BLE_SCANNER_MODE] is BLEScannerMode.AUTO
+
     await hass.config_entries.async_unload(entry.entry_id)
 
 
diff --git a/tests/components/shelly/test_init.py b/tests/components/shelly/test_init.py
index 70f005e5934..0eaa3192ca1 100644
--- a/tests/components/shelly/test_init.py
+++ b/tests/components/shelly/test_init.py
@@ -1,6 +1,7 @@
 """Test cases for the Shelly component."""
 
 from ipaddress import IPv4Address
+from typing import Any
 from unittest.mock import AsyncMock, Mock, call, patch
 
 from aioshelly.block_device import COAP
@@ -608,7 +609,7 @@ async def test_ble_scanner_unsupported_firmware_fixed(
     """Test device init with unsupported firmware."""
     issue_id = BLE_SCANNER_FIRMWARE_UNSUPPORTED_ISSUE_ID.format(unique=MOCK_MAC)
     entry = await init_integration(
-        hass, 2, options={CONF_BLE_SCANNER_MODE: BLEScannerMode.ACTIVE}
+        hass, 2, options={CONF_BLE_SCANNER_MODE: BLEScannerMode.AUTO}
     )
 
     assert issue_registry.async_get_issue(DOMAIN, issue_id)
@@ -623,6 +624,80 @@ async def test_ble_scanner_unsupported_firmware_fixed(
     assert len(issue_registry.issues) == 0
 
 
+@pytest.mark.parametrize(
+    ("starting_options", "expected_mode"),
+    [
+        ({CONF_BLE_SCANNER_MODE: BLEScannerMode.ACTIVE}, BLEScannerMode.AUTO),
+        ({CONF_BLE_SCANNER_MODE: BLEScannerMode.PASSIVE}, BLEScannerMode.PASSIVE),
+        ({CONF_BLE_SCANNER_MODE: BLEScannerMode.DISABLED}, BLEScannerMode.DISABLED),
+        ({}, None),
+    ],
+    ids=["active_to_auto", "passive_kept", "disabled_kept", "no_option"],
+)
+async def test_migrate_ble_scanner_mode(
+    hass: HomeAssistant,
+    mock_rpc_device: Mock,
+    starting_options: dict[str, Any],
+    expected_mode: BLEScannerMode | None,
+) -> None:
+    """Active migrates to Auto once; other modes stay put."""
+    entry = MockConfigEntry(
+        domain=DOMAIN,
+        data={
+            CONF_HOST: "192.168.1.37",
+            CONF_SLEEP_PERIOD: 0,
+            CONF_MODEL: MODEL_PLUS_2PM,
+            "gen": 2,
+        },
+        unique_id=MOCK_MAC,
+        options=starting_options,
+        title="Test name",
+        minor_version=2,
+    )
+    entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(entry.entry_id)
+    await hass.async_block_till_done(wait_background_tasks=True)
+
+    assert entry.minor_version == 3
+    assert entry.options.get(CONF_BLE_SCANNER_MODE) == expected_mode
+
+
+@pytest.mark.parametrize(
+    ("entry_version", "entry_minor_version"),
+    [(2, 1), (1, 4)],
+    ids=["future_major", "future_minor"],
+)
+async def test_migrate_ble_scanner_mode_future_version(
+    hass: HomeAssistant,
+    mock_rpc_device: Mock,
+    entry_version: int,
+    entry_minor_version: int,
+) -> None:
+    """Future versions are not downgraded."""
+    entry = MockConfigEntry(
+        domain=DOMAIN,
+        data={
+            CONF_HOST: "192.168.1.37",
+            CONF_SLEEP_PERIOD: 0,
+            CONF_MODEL: MODEL_PLUS_2PM,
+            "gen": 2,
+        },
+        unique_id=MOCK_MAC,
+        options={CONF_BLE_SCANNER_MODE: BLEScannerMode.ACTIVE},
+        title="Test name",
+        version=entry_version,
+        minor_version=entry_minor_version,
+    )
+    entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(entry.entry_id)
+    await hass.async_block_till_done(wait_background_tasks=True)
+
+    assert entry.state is ConfigEntryState.MIGRATION_ERROR
+    assert entry.version == entry_version
+    assert entry.minor_version == entry_minor_version
+    assert entry.options[CONF_BLE_SCANNER_MODE] == BLEScannerMode.ACTIVE
+
+
 async def test_blu_trv_stale_device_removal(
     hass: HomeAssistant,
     mock_blu_trv: Mock,