diff --git a/homeassistant/components/zha/sensor.py b/homeassistant/components/zha/sensor.py
index b02b3a549be..78bc8fcbe4e 100644
--- a/homeassistant/components/zha/sensor.py
+++ b/homeassistant/components/zha/sensor.py
@@ -186,7 +186,9 @@ class Battery(Sensor):
             state_attrs["battery_quantity"] = battery_quantity
         battery_voltage = self._channel.cluster.get("battery_voltage")
         if battery_voltage is not None:
-            state_attrs["battery_voltage"] = round(battery_voltage / 10, 1)
+            v_10mv = round(battery_voltage / 10, 2)
+            v_100mv = round(battery_voltage / 10, 1)
+            state_attrs["battery_voltage"] = v_100mv if v_100mv == v_10mv else v_10mv
         return state_attrs