The M12™ Charger accepts all M12™ REDLITHIUM™ Batteries, so you will always be prepared and productive. Power up your compact batteries in 30 minutes and extended capacity batteries in 60 minutes, without the need for extra charges on the jobsite. The MILWAUKEE M12™ REDLITHIUM™ HIGH OUTPUT™ 2.5Ah Compact Battery delivers 25% more power and runs 25% cooler than the M12™ REDLITHIUM™ 2.0Ah Compact Battery.