Yes. Of course, a 24-volt power battery is much faster than a 12-volt battery. A 24-volt battery in a Power Wheels car can reach a maximum speed of 6 miles per hour, whereas a 12V battery can reach a speed of 6mph. Voltage is not a factor. The speed of your power wheels will depend on other factors, such as the rider's weight and the terrain. On the other hand, the battery's voltage does not affect the speed of charge or discharge. The only thing that affects the voltage is the amount of energy that can be stored in the battery.