user14508: I have two 6 volts DC motors connected to L298N motor Driver. Do I need to use 12 Volts battery?

user4143: No, you need to use a (roughly) 6V battery. They are 6V motors, so they need a 6V battery.
However, you do need to sum the currents not the voltages. The battery must be able to provide at least the current required by both motors together.

14508: <p>I have <strong>two 6 volts DC motors</strong> connected to <strong>L298N motor Driver</strong>. Do I need to use 12 Volts battery?</p>
 4143: <p>No, you need to use a (roughly) 6V battery. They are 6V motors, so they need a 6V battery.</p>

<p>However, you <em>do</em> need to sum the <em>currents</em> not the voltages. The battery must be able to provide <em>at least</em> the current required by <em>both</em> motors together.</p>
