As storers devices for electric power , among hundreds of other applications, propelling conveyor and forklift trucks , electric lead batteries where the electricity taken from the network accumulates through a chemical process and then used this energy is returned in the form of electric current. Essentially , the lead storage battery is composed of positive plates and negative plates separated from one another by elements called spacers generally made of a plastic material . The package of plates and separators is placed inside a box of acid resistant ebonite and bathed in the electrolyte which is nothing but dilute sulfuric acid in distilled water. Will the box covered with a paste composed based on asphalt , also resistant to acid , through the lid of the terminal or terminals protruding from each element, and the nozzles to monitor plates and filled in. distilled water when necessary. Each set of plates , also called cell , provides a terminal voltage of 2V . and several elements connected “in series” give us the battery voltage , namely nx2 . In Ameise trucks typically 12 elements that we used : 12×2 = 24 . and models : 40×2 = 80V . There are batteries with flat plates or grids and armored tube sheets .