The Milwaukee M18 HB12 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.

They also feature a fuel gauge to display their remaining charge.

Battery Capacity: 12.0Ah
Battery Chemistry: Li-ion
Voltage: 18V