This 18V LXT Lithium-Ion Cordless 2-Piece Combo Kit (model XT257MB) has two BL Brushless Motor solutions that deliver longer run time, increased power and speed, and longer tool life. The 18V LXT 4.0Ah battery provides 35% more run time per charge than the 3.0Ah battery (BL1830), yet it charges in only 40 minutes for less downtime and increased productivity. For added convenience, the batteries feature on-board L.E.D. charge level indicators. The XT257MB includes a BL Brushless Motor Hammer Driver-Drill with 1,090 in.lbs. of torque, the most in the category. The kit also includes a BL Brushless Motor Impact Driver with a full 1,420 in.lbs. of Max Torque, yet weighs only 3.4 lbs. (with battery). The XT257MB is a total solution for most drilling, driving and fastening applications. Both tools feature Extreme Protection Technology (XPT), engineered for increased dust and water resistance for operation in harsh job site conditions. It’s part of Makita’s expanding 18V Lithium-Ion series, the world’s largest cordless tool line-up powered by an 18V Lithium-Ion slide-style battery. Makita 18V Lithium-Ion batteries have the fastest charge times in their categories, so they spend more time working and less time sitting on the charger.