The MILWAUKEE M12 REDLITHIUM HIGH OUTPUT CP2.5 Battery Pack delivers 25 percent more power and runs 25 percent cooler than other Milwaukee M12 REDLITHIUM CP battery packs. This increased performance of the lithium-ion battery gives you the same power and runtime of a MILWAUKEE M12 REDLITHIUM XC battery in a lighter and more compact package. The 12-volt battery pack delivers fade-free power and 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 0 degree F/-18 degree C. In addition, the M12 REDLITHIUM HIGH OUTPUT CP2.5 is built with a resistant housing, providing increased protection against exposure to common oils, greases, and solvents found in transportation maintenance and manufacturing environments. The Milwaukee M12 REDLITHIUM HIGH OUTPUT CP2.5 is fully compatible with 125 M12 solutions.