Enable battery statistics

custom_components/wiser/sensor.py

@@ -286,6 +286,10 @@ def device_class(self):
         """Return the class of the sensor."""
         return SensorDeviceClass.BATTERY
 
+    @property
+    def state_class(self):
+        return SensorStateClass.MEASUREMENT
+
     @property
     def native_unit_of_measurement(self):
         """Return the unit of measurement of this entity."""