What's the difference between 12V and 24V ride-on cars?

Across the reviewers we read, 12V models are slower (typically around 3-4 mph) and best for toddlers and lighter single riders, while 24V models add power for hills, rougher terrain, and two-seat capacity. Specialist community threads on r/PowerWheelsMods note 24V cars are heavier and harder to transport but handle added rider weight far better, so the right choice depends on your child's age, weight, and whether you want room for a friend.