Powered by FUEL™ technology, the M18 FUELTM 1-1/8” SDS Plus Rotary Hammer delivers faster than corded speed, corded durability, and all day work on one charge. The Milwaukee POWERSTATE™ Brushless Motor Provides 3.3 ft-lbs of impact energy, 0-1,350 RPM and 0-5,000 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.