diff --git a/BatteryWidget/BatteryGraph.cs b/BatteryWidget/BatteryGraph.cs
new file mode 100644
index 0000000..e011ce5
--- /dev/null
+++ b/BatteryWidget/BatteryGraph.cs
@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Text;
+
+namespace BatteryWidget {
+
+    public class BatteryGraph {
+
+        private const int MAX_GRAPH_POINTS = 50;
+
+        private bool isShowing;
+        private List<int> percentage;
+
+        public BatteryGraph() {
+            isShowing = false;
+
+            percentage = new List<int>();
+        }
+
+        public bool graphIsShowing() {
+            return isShowing;
+        }
+
+        public bool revertShowState() {
+            isShowing = !isShowing;
+            return isShowing;
+        }
+
+        public void addPercent(int currentPercentage) {
+            percentage.Add(currentPercentage);
+
+            while (percentage.Count >= MAX_GRAPH_POINTS) {
+                percentage.RemoveAt(0);
+            }
+        }
+
+        public void drawGraph(Graphics g) {
+            float width = g.VisibleClipBounds.Width;
+            float height = g.VisibleClipBounds.Height;
+
+            float deltaX = width / MAX_GRAPH_POINTS;
+            float x1 = 0;
+            float y1 = (100 - percentage[0]) * height / 100;
+            for (int i = 1; i < percentage.Count; i++) {
+                float x2 = x1 + deltaX;
+                float y2 = (100 - percentage[i]) * height / 100;
+
+                g.DrawLine(Pens.Silver, x1, y1, x2, y2);
+
+                x1 = x2;
+                y1 = y2;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/BatteryWidget/BatteryWidget.csproj b/BatteryWidget/BatteryWidget.csproj
index a09e55e..7e8e129 100644
--- a/BatteryWidget/BatteryWidget.csproj
+++ b/BatteryWidget/BatteryWidget.csproj
@@ -41,6 +41,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Battery.cs" />
+    <Compile Include="BatteryGraph.cs" />
     <Compile Include="WidgetForm.cs">
       <SubType>Form</SubType>
     </Compile>