diff --git a/homeassistant/components/nut/const.py b/homeassistant/components/nut/const.py
index 74d9614c29b..59d5cd484af 100644
--- a/homeassistant/components/nut/const.py
+++ b/homeassistant/components/nut/const.py
@@ -231,6 +231,7 @@ SENSOR_TYPES: Final[dict[str, SensorEntityDescription]] = {
         native_unit_of_measurement=PERCENTAGE,
         device_class=DEVICE_CLASS_BATTERY,
         state_class=STATE_CLASS_MEASUREMENT,
+        entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
     ),
     "battery.charge.low": SensorEntityDescription(
         key="battery.charge.low",