-LXT Lithium-Ion battery and optimum charging system produces 430% total lifetime work with 2.5x more cycles. . -2-Speed ½" Hammer Driver-Drill (0-400 / 0-1,500 RPM) with Makita-built 4-pole motor delivers 450 in.lbs. of torque and weighs only 4.2 lbs.. -Variable speed Impact Driver (0-2,300 RPM) provides 1,330 in.lbs. of torque in a compact design and weighs only 3.4 lbs..