The M12™ REDLITHIUM™ HIGH OUTPUT™ 5.0Ah Battery delivers 25% more power and runs 25% cooler than the M12™ REDLITHIUM™ 4.0Ah Battery. The increase in power elevates the performance of the entire M12™ system and drives the next breakthrough in M12 FUEL™. The lithium-ion battery runs substantially cooler through demanding applications, allowing you to push your cordless power tools throughout a wide range of applications. Each battery pack is built for heavy-duty use, runs cooler, and performs in climates below -18°C. In addition, the M12™ REDLITHIUM™ HIGH OUTPUT™ 5.0Ah Battery is built with a resistant housing, increasing the protection against exposure to common oils, greases, and solvents found in transportation maintenance and manufacturing environments. The M12™ REDLITHIUM™ HIGH OUTPUT™ 5.0Ah battery is fully compatible with Milwaukee M12™ solutions