Question: what is the difference in voltage for cordless drills?
Answer: Voltage ratings of 4 to 8 volts are sufficient for light-duty cordless screwdrivers, but drills with 12 to 18 volts will meet most homeowners' work needs. A high-power model handles heavier work, but more voltage means the tool has a bigger, heavier battery. A cordless drill battery needs recharging periodically.