Milwaukee's M18 REDLITHIUM XC5.0 Extended Capacity Battery Pack (48-11-1850) included in this promotional package provides the runtime needed to keep the fan operating when power outlets are unavailable. Built with advanced REDLITHIUM technology and REDLINK intelligence, the battery delivers consistent power output while helping protect against overload and overheating. The extended-capacity design supports longer cordless operation between charges, making it well-suited for demanding jobsite conditions. Together, the brushless fan and XC5.0 battery create a practical cordless solution that combines mobility, runtime, and reliable airflow for a wide range of work and recreational environments.