The Milwaukee M18 HB HIGH OUTPUT™ Slide Battery Pack provides 50 more power and runs 50 cooler vs M18 REDLITHIUM HD battery packs The massive increase in power elevates the performance of the entire M18 system and drives the next breakthrough in M18 FUEL™ delivering the power of a 15A corded product It delivers fade-free power and runs substantially cooler through heavy applications allowing tradesmen to push their cordless tools harder and longer than ever before It is the best performing cold weather pack ever made providing increased power in extreme cold weather conditions below 0°F -18°C Provides the most work per charge of any professional power tool battery in the industry driving full corded replacement on the job site It also features a fuel gauge to display the remaining charge