diff --git a/homeassistant/components/ecowitt/binary_sensor.py b/homeassistant/components/ecowitt/binary_sensor.py
index f73467288a2..1ef2956d84b 100644
--- a/homeassistant/components/ecowitt/binary_sensor.py
+++ b/homeassistant/components/ecowitt/binary_sensor.py
@@ -11,6 +11,7 @@ from homeassistant.components.binary_sensor import (
     BinarySensorEntityDescription,
 )
 from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import EntityCategory
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
@@ -22,7 +23,9 @@ ECOWITT_BINARYSENSORS_MAPPING: Final = {
         key="LEAK", device_class=BinarySensorDeviceClass.MOISTURE
     ),
     EcoWittSensorTypes.BATTERY_BINARY: BinarySensorEntityDescription(
-        key="BATTERY", device_class=BinarySensorDeviceClass.BATTERY
+        key="BATTERY",
+        device_class=BinarySensorDeviceClass.BATTERY,
+        entity_category=EntityCategory.DIAGNOSTIC,
     ),
 }
 
diff --git a/homeassistant/components/ecowitt/sensor.py b/homeassistant/components/ecowitt/sensor.py
index dccb3747c60..6845fb64d4c 100644
--- a/homeassistant/components/ecowitt/sensor.py
+++ b/homeassistant/components/ecowitt/sensor.py
@@ -125,6 +125,7 @@ ECOWITT_SENSORS_MAPPING: Final = {
         device_class=SensorDeviceClass.VOLTAGE,
         native_unit_of_measurement=UnitOfElectricPotential.VOLT,
         state_class=SensorStateClass.MEASUREMENT,
+        entity_category=EntityCategory.DIAGNOSTIC,
     ),
     EcoWittSensorTypes.LIGHTNING_COUNT: SensorEntityDescription(
         key="LIGHTNING_COUNT",