This Bosch 18V Bulldog™ hammer consistently outperforms the best-selling 1 In. corded 11255VSR Bulldog™, making it better than the best. The Bosch GBH18V-26K25 kit pairs two CORE18V 4.0 Ah Compact Batteries with an SDS-plus® Bulldog™ 1 In. Rotary Hammer that delivers 1.9 Ft.-Lbs. of impact energy (EPTA). The hammer’s brushless motor maximizes battery runtime for extended performance. It also has KickBack Control, an integrated sensor to stop tool rotation in bind-up situations; Electronic Precision Control, for smoother bit starts; and Vibration Control, for extended user comfort. It weighs only 7.4 Lbs. (with included battery). The kit features two CORE18V Compact Batteries, which deliver light weight and high power, and they are equipped with CoolPack technology for extended life. They are engineered with 21700 cell technology and advancements in design to reduce resistance and increase efficiency.