The Milwaukee M18 REDLITHIUM HIGH OUTPUT CP3.0 Starter Kit provides 50% more power and runs 50% cooler vs M18 REDLITHIUM CP battery packs. This increased performance results in the same power and runtime of a M18 REDLITHIUM XC extended capacity battery in a lighter and more compact package. The 18-volt battery pack delivers fade-free power and runs substantially cooler through heavy applications, allowing trade professionals to push their cordless tools throughout a wide application range. The REDLITHIUM HIGH OUTPUT CP3.0 battery is fully compatible with all 175+ Milwaukee M18 solutions. The M18 & M12 Multi-Voltage Charger accepts all M18 and M12 batteries, so you'll always be prepared and productive, especially on jobs that require a mix of M12 and M18 Milwaukee cordless power tools. The charger communicates directly with the battery pack to monitor cell voltage, temperature and charge status to ensure a full charge. As an added level of communication, the charger indicates when the lithium-ion battery reaches an 80% charge, providing confidence that the battery can complete a substantial amount of work without waiting for a full charge.