Series Cells:
When various cells are linked in series as like in the Figure, the total voltage output of the battery is equal to the sum of the individual cell voltages. In the instance of the battery in Figure, the four 1.5V cells give a total of 6 volts. Whenever we connect cells in series, the positive terminal of one cell is linked to the negative terminal of the next cell. The current flow by a battery connected in series is the similar as for one cell.
Figure Cells Connected in Series