This blog is about Cell Voltage
The cell voltage is determined by the equilibrium thermodynamic reactions that take place inside the cell, however, this value is often difficult to measure, and therefore, the open-circuit voltage (OCV) measured between the anode and cathode terminals are used instead. For some battery technologies (e.g., lead-acid), the OCV can be used as a basic estimate of the state of charge (SoC). Another measure often used is the closed-circuit voltage (CCV), which depends on the load current, state of charge, and cell usage history. Finally, battery manufacturers provide the nominal voltage value, from the cell’s characterization and therefore, cannot be experimentally verified
A six-volt battery has three single cells, which when fully charged produce an output voltage of 6.3 volts. A twelve-volt battery has six single cells in series producing a fully charged output voltage of 12.6 volts.