The Makita 18V Cordless 4-1/2” Paddle Switch Cut-Off/Angle Grinder, No. XAG06M, uses the company's LXT Li-ion 4.0Ah battery and brushless motor. According to the company, the Automatic Speed Change technology - which is engineered to adjust speed and torque during grinding or cutting applications - delivers a corded grinding performance. The brushless motor runs cooler and more efficiently to extend the life of the tool and increase run-time. The grinder delivers 8,500 rpm, and the spiral bevel gears are engineered for smoother rotations. With the company's Star Protection Computer Controls, the 5.6-lb tool features a large flush-mount paddle switch, a rubberized soft grip and a three-stage LED gauge to indicate battery charge level.