diff --git a/homeassistant/components/sensor/nest.py b/homeassistant/components/sensor/nest.py
index 4423e517bf5..f3a5e5dca7c 100644
--- a/homeassistant/components/sensor/nest.py
+++ b/homeassistant/components/sensor/nest.py
@@ -21,7 +21,7 @@ SENSOR_TYPES = ['humidity',
                 'last_connection',
                 'battery_level']
 
-SENSOR_UNITS = {'humidity': '%', 'battery_level': '%'}
+SENSOR_UNITS = {'humidity': '%', 'battery_level': 'V'}
 
 SENSOR_TEMP_TYPES = ['temperature',
                      'target',