This Milwaukee Combo Kit includes the M12 and M18 Multi-Voltage Charger and one M18 REDLITHIUM XC extended capacity battery. The charger accepts all M12 and M18 batteries, so you’ll always be prepared, especially on jobs that require a mix of M12 and M18 Milwaukee cordless power tools. This versatile unit charges batteries sequentially, reducing your time to manage charge cycles. You can power up your Milwaukee compact batteries in 30 minutes and extended capacity batteries in 60 minutes. It communicates directly with the battery to monitor cell voltage, temperature and charge status to ensure a full charge. The M18 REDLITHIUM XC extended capacity battery is designed with superior pack construction, electronics and performance to optimize work per charge and work over pack life.