Aggiunta iconcina.

diff --git a/BatteryMonitor.py b/BatteryMonitor.py
old mode 100644
new mode 100755
index 8409451..5b2f505
--- a/BatteryMonitor.py
+++ b/BatteryMonitor.py
@@ -1,4 +1,7 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
 import subprocess, re, gtk, gobject
+from numpy.linalg import lstsq

 class BatteryMonitor():

@@ -40,7 +43,9 @@ class BatteryIcon():
     def __init__(self):

         self.interval = 10000
-        self.tray = gtk.status_icon_new_from_stock (gtk.STOCK_OPEN)
+        # self.tray = gtk.status_icon_new_from_stock (gtk.STOCK_OPEN)
+
+        self.tray = gtk.status_icon_new_from_file ("clock.svg")
         self.tray.set_visible (True)

         self.bm = BatteryMonitor ()
@@ -70,6 +75,7 @@ class BatteryIcon():
         if not self.bm.OnBattery ():
             self.energy = []
             self.tray.set_tooltip ("Batteria non in uso")
+            self.ScheduleNext ()
             return

         energy = self.bm.GetEnergy ()
@@ -83,7 +89,14 @@ class BatteryIcon():
         elif (len(self.energy) > 100):
             del self.energy[0]

-        rate = (self.energy[0] - energy) * 1000 / (self.interval * (len(self.energy) - 1))
+        times = []
+        counter = 0
+        for value in self.energy:
+            times.append( [ 1, counter ] )
+            counter = counter + 10
+
+        rate = (-1) *  lstsq(times, self.energy)[0][1]
+
         time_to_discharge = energy / rate

         self.tray.set_tooltip("Tempo alla scarica: %s" % self.GetTimeString(time_to_discharge))
diff --git a/clock.svg b/clock.svg
new file mode 100644
index 0000000..b1e83c8
--- /dev/null
+++ b/clock.svg
@@ -0,0 +1,104 @@
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+
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+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
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+   height="32"
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+   version="1.1"
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