Powered by FUEL™ technology, the M18 FUEL™ 1" SDS Plus D-Handle Rotary Hammer delivers faster than corded speed, corded durability and all day work on one charge. The Milwaukee® POWERSTATE™ Brushless Motor Provides 2.1 ft-lbs. of impact energy, 0-1,500 RPM and 0-4,400 BPM. The M18™ REDLITHIUM™ HIGH DEMAND™ 9.0 Battery Pack delivers up to 5X more run-time, 35% more power, and runs 60% cooler than standard 18V lithium-ion batteries.  It maintains full power and runs substantially cooler through heavy applications, allowing users to push their cordless tools harder and longer than ever before.  The M18™ REDLITHIUM™ HIGH DEMAND™ 9.0 battery is fully compatible with 100+ M18™ tools.