diff --git a/ev3/ev3dev.py b/ev3/ev3dev.py
index 19544bc..34fc177 100755
--- a/ev3/ev3dev.py
+++ b/ev3/ev3dev.py
@@ -104,30 +104,7 @@ def fset(self, value):
 
         return cls
 
-
-class Ev3Dev(object):
-
-    def __init__(self):
-        self.sys_path = ""
-
-    def read_value(self, name):
-        attr_file = os.path.join(self.sys_path, name)
-        if os.path.isfile(attr_file):
-            with open(attr_file) as f:
-                value = f.read().strip()
-                return value
-        else:
-            return None
-
-    def write_value(self, name, value):
-        attr_file = os.path.join(self.sys_path, name)
-        if os.path.isfile(attr_file):
-            with open(attr_file, 'w') as f:
-                f.write(str(value))
-        else:
-            return
-
-    def get_battery_percentage(self):
+def get_battery_percentage():
         """
         Return an int() of the percentage of battery life remaining
         """
@@ -181,6 +158,30 @@ def get_battery_percentage(self):
                          (voltage_max, voltage_min, voltage_now))
             return 0
 
+class Ev3Dev(object):
+
+    def __init__(self):
+        self.sys_path = ""
+
+    def read_value(self, name):
+        attr_file = os.path.join(self.sys_path, name)
+        if os.path.isfile(attr_file):
+            with open(attr_file) as f:
+                value = f.read().strip()
+                return value
+        else:
+            return None
+
+    def write_value(self, name, value):
+        attr_file = os.path.join(self.sys_path, name)
+        if os.path.isfile(attr_file):
+            with open(attr_file, 'w') as f:
+                f.write(str(value))
+        else:
+            return
+
+    
+
 @create_ev3_property(
     bin_data={'read_only': True},
     bin_data_format={'read_only': True},
diff --git a/setup.py b/setup.py
index 73c4a9b..f00e4a8 100755
--- a/setup.py
+++ b/setup.py
@@ -3,12 +3,12 @@
 from setuptools  import setup
 
 setup(name='python-ev3',
-      version='0.0.2.2',
+      version='0.0.2.3',
       license='Apache License 2.0',
       description='Python library of ev3dev firmware',
       author='Gong Yi',
       author_email='topikachu@163.com',
       url='https://github.com/topikachu/python-ev3',
       packages=['ev3'],
-      download_url="https://github.com/topikachu/python-ev3/releases/tag/0.0.2.2"
+      download_url="https://github.com/topikachu/python-ev3/releases/tag/0.0.2.3"
      )