The HERCULES™ Brushless Cordless Drywall Screwgun drives 3000 screws per charge.* The fast auto-drive mode starts driving on contact with the drywall. The auto-drive mode is a lock-on mode so the motor only starts when the fastener is engaged helping extend battery runtime. Powered by the HERCULES™ Lithium-Ion Battery System, this screwgun goes where the job takes it.