Add Battery class

Helios/Source/Battery.cs

+using System;
+namespace Helios.Source
+{
+	public class Battery
+	{
+        public int Capacity { get; set; }
+        public int Voltage { get; set; }
+        public double Charge { get; private set; }
+        public double DepthOfDischarge { get; private set; }
+        
+        public Battery() { }
+
+        public Battery(int capacity, int voltage)
+        {
+            this.Capacity = capacity;
+            this.Voltage = voltage;
+        }
+
+        public double GetCharge(double powerBalence)
+        {
+            double charge;
+
+            charge = powerBalence / this.Voltage;
+
+            this.Charge = charge;
+
+            return charge;
+        }
+
+        public double GetDepthOfDischarge()
+        {
+            double depthOfDischarge;
+
+            depthOfDischarge = (1 - (this.Charge / this.Capacity)) * 100;
+
+            this.DepthOfDischarge = depthOfDischarge;
+
+            return depthOfDischarge;
+        }
+	}
+}
+