When connecting batteries in series, how should the terminals be connected?

Connecting batteries in series requires that the positive terminal of one battery is connected to the negative terminal of the next battery. This arrangement ensures that the voltage of each battery adds up, allowing the total voltage output of the series connection to be the sum of the individual batteries. For instance, if you connect two 12-volt batteries in this manner, the total output voltage will be 24 volts.

This configuration creates a continuous circuit, allowing the flow of current through each battery in succession. It is crucial to connect them this way because connecting negative to negative or positive to positive would not increase the total voltage and could potentially lead to improper functioning or damage to the batteries. By following the series connection method, you achieve the desired voltage increase while maintaining the capacity and efficiency of the batteries in the circuit.