The Milwaukee M12 REDLITHIUM CP2.0 2PK Starter Pack offers up to double the runtime, 20% more power, and twice the recharges compared to standard lithium-ion batteries. Its robust, high-performance battery pack ensures more work per charge and extended pack life. Each battery pack is durably constructed for heavy-duty use, operates cooler, and functions in sub-zero temperatures. The compact, lightweight design allows for easy maneuvering in tight spaces and reduces user fatigue. Built-in REDLINK Intelligence safeguards the battery from overloads and cell damage, while an integrated temperature management system and individual cell monitoring maximize battery life. Upgrade your M12 cordless tools' runtime and durability by switching to our REDLITHIUM CP2.0 Compact Battery Pack. The M12 charger quickly powers up all M12 batteries, while the M12 Lithium-Ion Charger communicates directly with the battery pack for efficient charging in under an hour. The charger's slim profile saves bench-top space, and the onboard indicator light monitors battery charges for all your M12 cordless tools.