From 7ab15c0e79fecdfaa0f29f6691b45429a6a04cdc Mon Sep 17 00:00:00 2001
From: Erik Eriksson <molobrakos@users.noreply.github.com>
Date: Tue, 28 Nov 2017 15:32:36 +0100
Subject: [PATCH] Tellduslive: Use magic constants for battery level. Also, the
 previous formula for battery level was wrong. (#10788)

---
 homeassistant/components/tellduslive.py | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/homeassistant/components/tellduslive.py b/homeassistant/components/tellduslive.py
index fa8916aca11..ba7c1afd286 100644
--- a/homeassistant/components/tellduslive.py
+++ b/homeassistant/components/tellduslive.py
@@ -343,8 +343,17 @@ class TelldusLiveEntity(Entity):
     @property
     def _battery_level(self):
         """Return the battery level of a device."""
-        return round(self.device.battery * 100 / 255) \
-            if self.device.battery else None
+        from tellduslive import (BATTERY_LOW,
+                                 BATTERY_UNKNOWN,
+                                 BATTERY_OK)
+        if self.device.battery == BATTERY_LOW:
+            return 1
+        elif self.device.battery == BATTERY_UNKNOWN:
+            return None
+        elif self.device.battery == BATTERY_OK:
+            return 100
+        else:
+            return self.device.battery  # Percentage
 
     @property
     def _last_updated(self):