Interconnection of cells:
Cells may be connected in series, parallel or any combination of the two in order to form a battery. When cells are connected to form a battery they should be of similar construction, and have the same terminal voltage, internal resistance and capacity.
Series connection. When connected in series:
The battery voltage is the total of the individual cell voltages.
The battery resistance is equal to the total of the individual cell resistances.
The battery capacity is the same as the capacity of a single cell.
Parallel connection. When connected in parallel:
The battery voltage is the same as the voltage of a single cell.
The battery resistance is equal to the parallel total of the cell resistances.
The battery capacity is equal to the total of the individual cell capacities.
These rules can also be applied when connecting batteries together in series, parallel or any combination of the two.