To increase voltage when connecting batteries, how must they be connected?

To increase voltage when connecting batteries, they must be connected in series. When batteries are connected in series, the positive terminal of one battery is connected to the negative terminal of the next battery, thereby allowing the voltage of each battery to add together. For instance, if two 12-volt batteries are connected in series, the total voltage of the system becomes 24 volts.

This series configuration is essential for applications that require higher voltage output than what a single battery can provide. In contrast, parallel connections would maintain the same voltage as a single battery while increasing the capacity (amp-hours) of the setup. The combination and sequence terms do not accurately describe the method used specifically to increase voltage in battery configurations. Hence, connecting batteries in series is the correct approach for achieving a higher voltage.