The lead-acid battery is a reliable battery system that operates within a large temperature range, and its charge-discharge process is practically reversible. Lead acid batteries are used for starting, lighting, and ignition service on automobiles and trucks, as well as providing power for automobiles, forklifts, submarines, and almost all other motive vehicles. They are noted for their ability to withstand varied forms of maltreatment.
They often used as back-up power sources, when the primary battery or electrical power fails. Lead acid batteries use a simple set of reactions to provide energy. Some batteries have sealed for use in automobiles. Flooded acid lead batteries are those batteries where the electrodes / plates are immersed in electrolyte. Sealed lead acid batteries specially meant for automotive applications, for starting and lighting in vehicles, ambulance loaded vehicles, racing cars, transportable backup power etc.