Profile: The lead-acid storage battery, an important energy storage device, is the most widely used secondary storage cell by automobile and other industries. Storage cells are devices which release a flow of electron through an external circuit as a result of reactions occurring between the active electrode materials and ions transported by the electrolyte. The cells in which the reactions are reversible are called secondary cells. In these cells the active materials can be returned to their original state by applying electrical current from an external source in the opposite direction to the flow of the cells discharge current. We are dependent on lead acid batteries for many uses in our lives that can be subdivided into four broad categories: engine starting, motive power and standby power, valve regulated battery. There are two distinct designs of recombination battery currently use: Absorbed electrolyte and Gelled electrolyte. Lead acid battery industry is divided into three main sectors: SLI batteries, industrial batteries and transaction batteries. SLI batteries are primarily used in motor vehicle. Industrial batteries include those used for uninterrupted power supply and transaction batteries are used to power electric vehicles such as forklifts. Characteristics: The lead battery uses lead oxide as the active material of the positive electrode and metallic lead in a high surface area porous structure, as the negative material. The physical and chemical properties of these materials are listed below: • Typically a charged positive electrode contains both variations, ? PbO2 (Orthorhombic) and ? PbO2 (Tetragonal) • The equilibrium potential of the ? PbO2 is more positive than that of ? PbO2 by 0.01V. • The cured plate consists of lead sulphate, lead oxide and some residual lead (?5%). • The electrolyte is a sulfuric acid solution, about 1.28 specific gravity or 37% acid by weight in a fully charged condition. • As the cell discharges, both electrodes are converted to lead sulfate and the process reverses on charge. Application: The lead acid battery is used in a wide variety of applications, and in the past few years many new applications have arisen: • The most common use of the lead acid battery is for starting, lighting, and ignition in automobiles and other vehicles with internal combustion engines. • Lead acid batteries are used as the power source in off the road vehicles such as golf carts, forklift trucks, mining vehicles, and construction and industrial equipment. • It also has applications in DC Power System which includes a battery charger (rectifier/charger) which has a sufficient capacity to recharge the batteries at the proper voltage while simultaneously supplying power to the dc load. • In Static uninterruptible AC Power System (UPS) a storage battery is linked to the utility power to provide a continuity of service in the event of an interruption of the utility power. • Valve regulated batteries are used for standby applications such as in telephonic systems, uninterruptible power systems, burglar, fire alarms and emergency lighting. Global Scenario Lead acid batteries are considered to have one of the fastest global growth rates. Usage of lead acid battery is expected to grow further with technological advancements in the electric vehicles market. Although efforts are on to develop a miracle battery for electric vehicles, lead acid batteries are one of the few battery technologies that are considered as the workhorses of today’s Electric Vehicle fleet. The influx of cutting edge technology has brought forth a new genre of long lasting, lead acid batteries featuring smaller size and lightweight attributes. The global market for Lead Acid Batteries (Automotive) is forecast to reach US$15.4 billion by the year 2015, charged by sustained demand from automobiles industry, specifically the aftermarket/replacement market. Emergence of next generation electric vehicles (EVs) and hybrid electric vehicles (HEVs) will further drive the market. Since there is a huge demand for Lead acid battery in market therefore the entrepreneur venturing in this field expects an enormous success.