diff --git a/custom_components/rct_power/lib/entities.py b/custom_components/rct_power/lib/entities.py
index 57fa7d7..659bcce 100644
--- a/custom_components/rct_power/lib/entities.py
+++ b/custom_components/rct_power/lib/entities.py
@@ -165,6 +165,7 @@ def get_matching_names(expression: str):
         name="Battery Minimum State of Charge",
         update_priority=EntityUpdatePriority.FREQUENT,
         state_class=SensorStateClass.MEASUREMENT,
+        native_unit_of_measurement="%",
     ),
     RctPowerSensorEntityDescription(
         get_device_info=get_battery_device_info,
@@ -172,6 +173,7 @@ def get_matching_names(expression: str):
         name="Battery Maximum State of Charge",
         update_priority=EntityUpdatePriority.FREQUENT,
         state_class=SensorStateClass.MEASUREMENT,
+        native_unit_of_measurement="%",
     ),
     RctPowerSensorEntityDescription(
         get_device_info=get_battery_device_info,