Makita BL1840BDC2 18V LXT Lithium-Ion Battery and Rapid...

18V LXT Lithium-Ion 4. 0Ah battery reaches a full charge in 40 minutes or less
Provides up to 35% more run time per charge compared to BL1830
Integrated L. E. D. battery charge level indicator allows user to monitor battery charge
Automatic speed change technology adjusts speed and torque during operation for optimum performance
Active feedback sensing technology (aft) turns the motor off if rotation of the wheel is suddenly forced to stop
The BL Brushless motor eliminates carbon brushes, enabling the BL motor to run cooler and more efficiently for longer life