diff --git a/homeassistant/components/template/strings.json b/homeassistant/components/template/strings.json
index be5fb1866ea..96c8435c25c 100644
--- a/homeassistant/components/template/strings.json
+++ b/homeassistant/components/template/strings.json
@@ -440,6 +440,12 @@
       }
     }
   },
+  "issues": {
+    "deprecated_battery_level": {
+      "title": "Deprecated battery level option in {entity_name}",
+      "description": "The template vacuum options `battery_level` and `battery_level_template` are being removed in 2026.8.\n\nPlease remove the `battery_level` or `battery_level_template` option from the YAML configuration for {entity_id} ({entity_name})."
+    }
+  },
   "options": {
     "step": {
       "alarm_control_panel": {
diff --git a/homeassistant/components/template/vacuum.py b/homeassistant/components/template/vacuum.py
index 1abfdbd00da..242a534187a 100644
--- a/homeassistant/components/template/vacuum.py
+++ b/homeassistant/components/template/vacuum.py
@@ -34,11 +34,16 @@ from homeassistant.const import (
 )
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.exceptions import TemplateError
-from homeassistant.helpers import config_validation as cv, template
+from homeassistant.helpers import (
+    config_validation as cv,
+    issue_registry as ir,
+    template,
+)
 from homeassistant.helpers.entity_platform import (
     AddConfigEntryEntitiesCallback,
     AddEntitiesCallback,
 )
+from homeassistant.helpers.issue_registry import IssueSeverity
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 from .const import DOMAIN
@@ -188,6 +193,26 @@ def async_create_preview_vacuum(
     )
 
 
+def create_issue(
+    hass: HomeAssistant, supported_features: int, name: str, entity_id: str
+) -> None:
+    """Create the battery_level issue."""
+    if supported_features & VacuumEntityFeature.BATTERY:
+        key = "deprecated_battery_level"
+        ir.async_create_issue(
+            hass,
+            DOMAIN,
+            f"{key}_{entity_id}",
+            is_fixable=False,
+            severity=IssueSeverity.WARNING,
+            translation_key=key,
+            translation_placeholders={
+                "entity_name": name,
+                "entity_id": entity_id,
+            },
+        )
+
+
 class AbstractTemplateVacuum(AbstractTemplateEntity, StateVacuumEntity):
     """Representation of a template vacuum features."""
 
@@ -369,6 +394,16 @@ class TemplateStateVacuumEntity(TemplateEntity, AbstractTemplateVacuum):
             self.add_script(action_id, action_config, name, DOMAIN)
             self._attr_supported_features |= supported_feature
 
+    async def async_added_to_hass(self) -> None:
+        """Run when entity about to be added to hass."""
+        await super().async_added_to_hass()
+        create_issue(
+            self.hass,
+            self._attr_supported_features,
+            self._attr_name or DEFAULT_NAME,
+            self.entity_id,
+        )
+
     @callback
     def _async_setup_templates(self) -> None:
         """Set up templates."""
@@ -434,6 +469,16 @@ class TriggerVacuumEntity(TriggerEntity, AbstractTemplateVacuum):
                 self._to_render_simple.append(key)
                 self._parse_result.add(key)
 
+    async def async_added_to_hass(self) -> None:
+        """Run when entity about to be added to hass."""
+        await super().async_added_to_hass()
+        create_issue(
+            self.hass,
+            self._attr_supported_features,
+            self._attr_name or DEFAULT_NAME,
+            self.entity_id,
+        )
+
     @callback
     def _handle_coordinator_update(self) -> None:
         """Handle update of the data."""
diff --git a/tests/components/template/test_vacuum.py b/tests/components/template/test_vacuum.py
index 6c7222645b6..d0e6488e46e 100644
--- a/tests/components/template/test_vacuum.py
+++ b/tests/components/template/test_vacuum.py
@@ -15,7 +15,7 @@ from homeassistant.components.vacuum import (
 from homeassistant.const import STATE_OFF, STATE_ON, STATE_UNAVAILABLE, STATE_UNKNOWN
 from homeassistant.core import HomeAssistant, ServiceCall
 from homeassistant.exceptions import HomeAssistantError
-from homeassistant.helpers import entity_registry as er
+from homeassistant.helpers import entity_registry as er, issue_registry as ir
 from homeassistant.helpers.entity_component import async_update_entity
 from homeassistant.setup import async_setup_component
 
@@ -589,6 +589,37 @@ async def test_battery_level_template(
     _verify(hass, STATE_UNKNOWN, expected)
 
 
+@pytest.mark.parametrize(
+    ("count", "state_template", "extra_config", "attribute_template"),
+    [(1, "{{ states('sensor.test_state') }}", {}, "{{ 50 }}")],
+)
+@pytest.mark.parametrize(
+    ("style", "attribute"),
+    [
+        (ConfigurationStyle.LEGACY, "battery_level_template"),
+        (ConfigurationStyle.MODERN, "battery_level"),
+        (ConfigurationStyle.TRIGGER, "battery_level"),
+    ],
+)
+@pytest.mark.usefixtures("setup_single_attribute_state_vacuum")
+async def test_battery_level_template_repair(
+    hass: HomeAssistant, issue_registry: ir.IssueRegistry
+) -> None:
+    """Test battery_level template raises issue."""
+    # Ensure trigger entity templates are rendered
+    hass.states.async_set(TEST_STATE_SENSOR, VacuumActivity.DOCKED)
+    await hass.async_block_till_done()
+
+    assert len(issue_registry.issues) == 1
+    issue = issue_registry.async_get_issue(
+        "template", f"deprecated_battery_level_{TEST_ENTITY_ID}"
+    )
+    assert issue.domain == "template"
+    assert issue.severity == ir.IssueSeverity.WARNING
+    assert issue.translation_placeholders["entity_name"] == TEST_OBJECT_ID
+    assert issue.translation_placeholders["entity_id"] == TEST_ENTITY_ID
+
+
 @pytest.mark.parametrize(
     ("count", "state_template", "extra_config"),
     [