diff --git a/.gitignore b/.gitignore
index 49813ed..8859f1a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .DS_Store
 *.pyc
 .vscode/
+*.blend1
diff --git a/mechanism/Battery_box_for_18650_cells.scad b/mechanism/Battery_box_for_18650_cells.scad
new file mode 100644
index 0000000..bff5acb
--- /dev/null
+++ b/mechanism/Battery_box_for_18650_cells.scad
@@ -0,0 +1,244 @@
+/*
+ * Variables for Thingiverse Customizer
+ * ==================================================================
+ *
+ */
+
+// The number of cells in your battery holder
+Cell_Count = 2;
+// AA:50.5;18650:65
+Cell_Long = 65;
+// AA:14.5;18650:18
+Cell_Wide = 18;
+// 1:series connection; 2:parallel connection
+Connection = 1;	
+// 1:yes; 2:no
+mounting_flanges = 1; 
+
+/*
+ * Library function: edge
+ * ==================================================================
+ *
+ * Used to make roundes edges on objects
+ *
+ */
+module edge(radius, height)
+{
+	difference()
+	{
+		translate([radius/2-0.5, radius/2-0.5, 0])
+			cube([radius+1, radius+1, height], center = true);
+
+		translate([radius, radius, 0])
+			cylinder(h = height+1, r1 = radius, r2 = radius, center = true, $fn = 100);
+	}
+}
+
+module battery_box(cells)
+{
+	difference()
+	{
+		union()
+		{
+			translate([0, 0, Cell_Wide*(4/3)/4])
+				cube(size=[Cell_Long+7+7, Cell_Wide*cells, Cell_Wide*(4/3)/2], center=true);
+	
+			translate([Cell_Long/2+5.5, 0, Cell_Wide*(4/3)/2])
+				cube(size=[3, Cell_Wide*cells, Cell_Wide*(4/3)], center=true);
+
+			translate([-(Cell_Long/2+5.5), 0, Cell_Wide*(4/3)/2])
+				cube(size=[3, Cell_Wide*cells, Cell_Wide*(4/3)], center=true);
+
+			translate([-(Cell_Long/2+5-2), 0, Cell_Wide*0.8/2+Cell_Wide*(4/3)/4])
+				cube(size=[2, Cell_Wide*cells, Cell_Wide*0.7], center=true);
+
+			translate([(Cell_Long/2+5-2), 0, Cell_Wide*0.8/2+Cell_Wide*(4/3)/4])
+				cube(size=[2, Cell_Wide*cells, Cell_Wide*0.7], center=true);
+			 
+			// mounting flanges	
+            if (mounting_flanges == 1)
+            {
+			translate([20, cells*Cell_Wide/2+4/2, 3/2])
+				cube(size=[7, 4, 3], center=true);
+
+			translate([20, cells*Cell_Wide/2+4, 3/2])
+				cylinder(r=7/2, h=3, center=true, $fn = 60);
+
+			translate([-20, cells*Cell_Wide/2+4/2, 3/2])
+				cube(size=[7, 4, 3], center=true);
+
+			translate([-20, cells*Cell_Wide/2+4, 3/2])
+				cylinder(r=7/2, h=3, center=true, $fn = 60);
+
+			translate([20, -(cells*Cell_Wide/2+4/2), 3/2])
+				cube(size=[7, 4, 3], center=true);
+
+			translate([20, -(cells*Cell_Wide/2+4), 3/2])
+				cylinder(r=7/2, h=3, center=true, $fn = 60);
+
+			translate([-20, -(cells*Cell_Wide/2+4/2), 3/2])
+				cube(size=[7, 4, 3], center=true);
+
+			translate([-20, -(cells*Cell_Wide/2+4), 3/2])
+				cylinder(r=7/2, h=3, center=true, $fn = 60);
+		}
+    }
+        
+        if (mounting_flanges == 2)
+        {
+            
+        }
+		
+		for (i=[0:cells-1])
+		{
+			// battery cradle
+			translate([0, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, Cell_Wide/2+10/2])
+			rotate(90, [0, 1, 0])
+				cylinder(r=Cell_Wide/2, h=Cell_Long+2+2, center=true, $fn = 100);
+			
+			// spring cut-out
+			translate([Cell_Long/2+3.5, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, Cell_Wide/2+10/2])
+				cube(size=[1, 12, 12], center=true);
+            
+            translate([Cell_Long/2+3.5, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, Cell_Wide/2+10/2])
+				cube(size=[1, 4, 30], center=true);
+            
+            translate([Cell_Long/2+3-1/2, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, Cell_Wide/2+10/2])
+				cube(size=[1, 8, 12], center=true);
+			
+			translate([-(Cell_Long/2+3.5), -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, Cell_Wide/2+10/2])
+				cube(size=[1, 12, 12], center=true);
+            
+            translate([-(Cell_Long/2+3.5), -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, Cell_Wide/2+10/2])
+				cube(size=[1, 4, 30], center=true);
+            
+            translate([-(Cell_Long/2+3-1/2), -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, Cell_Wide/2+10/2])
+				cube(size=[1, 8, 12], center=true);
+
+			// solder flange cut-out
+			translate([(Cell_Long/2+5-6/2), -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, 3/2])
+				cube(size=[6, 6, 3.1], center=true);
+
+			translate([(Cell_Long/2)-1/2, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, 3/2])
+				cylinder(r=6/2, h=3.1, center=true, $fn = Cell_Long);
+
+			translate([-(Cell_Long/2+5-6/2), -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, 3/2])
+				cube(size=[6, 6, 3.1], center=true);
+
+			translate([-(Cell_Long/2)+1/2, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, 3/2])
+				cylinder(r=6/2, h=3.1, center=true, $fn = Cell_Long);
+
+			// polarity marking (+)
+			translate([20, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, 4/2+4.5])
+				cube(size=[6, 2, 4], center=true);
+
+			translate([20, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, 4/2+4.5])
+				cube(size=[2, 6, 4], center=true);
+
+			// polarity marking (-)
+			translate([-20, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*i, 4/2+4.5])
+				cube(size=[6, 2, 4], center=true);
+		}
+		
+		if (cells>=2)
+		{
+			for (i=[0:cells-2])
+			{
+				// bottom cut-out for cell connections
+				if (Connection == 1)
+				{
+					translate([0, -cells*Cell_Wide/2+Cell_Wide+Cell_Wide*i, 2.5/2])
+					rotate(17, [0, 0, 1])
+						cube(size=[Cell_Long, 2, 2.6], center=true);
+				}
+
+				if (Connection == 2)
+				{			
+					translate([Cell_Long/2+3, -cells*Cell_Wide/2+Cell_Wide+Cell_Wide*i, 2.5/2])
+					rotate(90, [0, 0, 1])
+						cube(size=[Cell_Wide, 2, 2.6], center=true);
+
+					translate([-Cell_Long/2-3, -cells*Cell_Wide/2+Cell_Wide+Cell_Wide*i, 2.5/2])
+					rotate(90, [0, 0, 1])
+						cube(size=[Cell_Wide, 2, 2.6], center=true);
+				}
+			}
+		}
+		
+		// bottom cut-out for output wires
+		translate([Cell_Long/4, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*0, 2.5/2])
+			cube(size=[Cell_Long/2, 2, 2.6], center=true);			
+
+		translate([3/2, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*0+1, 2.5/2])
+			edge(4, 2.6);
+
+		translate([3/2, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*0-1, 2.5/2])
+		rotate(-90, [0, 0, 1])
+			edge(4, 2.6);
+
+		translate([-Cell_Long/4, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*(cells-1), 2.5/2])
+			cube(size=[Cell_Long/2, 2, 2.6], center=true);			
+
+		translate([-3/2, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*(cells-1)+1, 2.5/2])
+		rotate(90, [0, 0, 1])
+			edge(4, 2.6);
+
+		translate([-3/2, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*(cells-1)-1, 2.5/2])
+		rotate(180, [0, 0, 1])
+			edge(4, 2.6);
+
+		// bottom polarity marking (+)
+		translate([7, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*0-4.5, 1.5/2])
+			cube(size=[4, 1.5, 1.6], center=true);
+
+		translate([7, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*0-4.5, 1.5/2])
+			cube(size=[1.5, 4, 1.6], center=true);
+
+		// bottom polarity marking (-)
+		translate([-7, -cells*Cell_Wide/2+Cell_Wide/2+Cell_Wide*(cells-1)+4.5, 1.5/2])
+			cube(size=[4, 1.5, 1.6], center=true);
+		
+		// mounting holes
+		translate([20, cells*Cell_Wide/2+4, 3/2])
+			cylinder(r=3.3/2, h=4, center=true, $fn = 30);
+
+		translate([-20, cells*Cell_Wide/2+4, 3/2])
+			cylinder(r=3.3/2, h=4, center=true, $fn = 30);
+
+		translate([20, -(cells*Cell_Wide/2+4), 3/2])
+			cylinder(r=3.3/2, h=4, center=true, $fn = 30);
+
+		translate([-20, -(cells*Cell_Wide/2+4), 3/2])
+			cylinder(r=3.3/2, h=4, center=true, $fn = 30);
+
+		// bottom cut-out for output wire
+		translate([0, 0, 2.5/2])
+			cube(size=[3, cells*Cell_Wide+5, 2.6], center=true);
+
+		// cutout to ease battery removal
+		translate([0, 0, 20/2+10/2])
+		rotate(90, [1, 0, 0])
+			cylinder(r=20/2, h=cells*Cell_Wide+5, center=true, $fn = 100);
+		
+		// rounded corners on end plates
+		translate([0, -cells*Cell_Wide/2, Cell_Wide*(4/3)])
+		rotate(90, [0, 1, 0])
+			edge(4, Cell_Long+8+8+5);
+
+		translate([0, cells*Cell_Wide/2, Cell_Wide*(4/3)])
+		rotate(90, [0, 1, 0])
+		rotate(-90, [0, 0, 1])
+			edge(4, Cell_Long+8+8+5);
+
+		translate([0, -cells*Cell_Wide/2, Cell_Wide*(4/3)*0.95-3])
+		rotate(90, [0, 1, 0])
+			edge(3, Cell_Long+4+4);
+
+		translate([0, cells*Cell_Wide/2, Cell_Wide*(4/3)*0.95-3])
+		rotate(90, [0, 1, 0])
+		rotate(-90, [0, 0, 1])
+			edge(3, Cell_Long+4+4);
+	}
+}
+
+battery_box(Cell_Count);
\ No newline at end of file
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