The M12™ REDLITHIUM™ HIGH OUTPUT™ 2.5Ah Compact Battery delivers 25% more power and runs 25% cooler than the M12™ REDLITHIUM™ 2.0Ah Compact Battery. This increased performance of the lithium-ion battery gives you the same power and runtime of an M12™ REDLITHIUM™ battery in a lighter and more compact package. The 12-volt battery pack runs substantially cooler through demanding applications, allowing you to push your cordless power tools throughout a wide range of applications. Its compact, lightweight design allows you to work in tight workspaces and reduces fatigue. Each battery pack is durably built for heavy-duty use, runs cooler, and performs in climates below -18°C. In addition, the M12™ REDLITHIUM™ HIGH OUTPUT™ 2.5Ah is built with a resistant housing, providing increased protection against exposure to common oils, greases, and solvents found in automotive and manufacturing environments. The M12™ REDLITHIUM™ HIGH OUTPUT™ 2.5Ah battery is fully compatible with Milwaukee M12™ solutions