The term 'battery block' refers to a complete individual battery. Multiple battery blocks can be connected into a battery string. A battery cell is an electrical circuit within an individual battery block consisting of positive and negative electrodes or plates, an electrolyte and separator. The battery cell will have a Vdc and will be arrange to make up the overall Vdc of the battery block. For example a 12Vdc battery block may comprise of 12x1Vdc battery cells.