The iON18SB is equipped with a 750 W brushless motor. Without going into an engineering lesson, brushless motors are smarter, more powerful and more efficient than their old school brushed cousins. So when comparing cordless devices, you can’t just compare voltage. A lower voltage brushless motor is far better than a higher voltage, old school brushed motor. So a new cordless unit with a brushless motor will mean that it can perform better and last longer on a charge than a comparable unit with a traditional cordless motor.