**6.4 Lithium based batteries**

Recently, lithium ion batteries are used in residential and commercial usage and in electric and hybrid vehicles, worldwide grid connected battery capacity is currently about 200 MW and is increasing very fast. Because of their high energy efficiency, compactness, maintenance free design, long life and versatility, these batteries are justified but for their precise management and charge control purpose electronic devices are used which make the system to be complex. With the research there will be improvement in their life cycle, energy density, cost reduction and charging/discharging characteristics and market value will be increased [9].
