Flex 24V Quick Eject FX1371A vs Hercules 20V Brushless HCB81B

Both are brushless 1/4 in impact drivers with one battery and charger in the box. The Flex FX1371A is the more capable tool on paper: 2,500 in-lbs of torque, 4,000 RPM, 4,450 IPM and a quick-eject chuck, with a 30-minute charge and a heat-resistant battery design. The Hercules HCB81B is a simpler 20V driver rated at 84 ft-lb (about 1,000 in-lbs) with a 5 Ah battery, so it favors longer runtime over raw fastening power. Buy the Flex for heavy driving and fast battery turnaround; buy the Hercules if you want a lighter-duty driver with a bigger battery.

• Choose the Flex 24V Quick Eject FX1371A if you drive long screws and lag bolts and want the most torque, speed and a quick bit change.
• Choose the Hercules 20V Brushless HCB81B if your work is mostly assembly and light fastening and you value a larger 5 Ah battery over peak power.