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.