diff --git a/homeassistant/components/xiaomi_aqara/__init__.py b/homeassistant/components/xiaomi_aqara/__init__.py
index 6e2298e05b9..26d0f351fa2 100644
--- a/homeassistant/components/xiaomi_aqara/__init__.py
+++ b/homeassistant/components/xiaomi_aqara/__init__.py
@@ -8,6 +8,7 @@ import voluptuous as vol
 from homeassistant.components.discovery import SERVICE_XIAOMI_GW
 from homeassistant.const import (
     ATTR_BATTERY_LEVEL,
+    ATTR_VOLTAGE,
     CONF_HOST,
     CONF_MAC,
     CONF_PORT,
@@ -323,6 +324,7 @@ class XiaomiDevice(Entity):
         max_volt = 3300
         min_volt = 2800
         voltage = data[voltage_key]
+        self._device_state_attributes[ATTR_VOLTAGE] = round(voltage/1000.0, 2)
         voltage = min(voltage, max_volt)
         voltage = max(voltage, min_volt)
         percent = ((voltage - min_volt) / (max_volt - min_volt)) * 100