The Makita AC Power Supply and Charger is for use with the Makita PDC1200 ConnectX™ 1,200Wh Portable Backpack Power Supply. It allows for extended run time to Makita 36V Connect X tools and equipment including the 36V ConnectX™ Brushless 21" Self-Propelled Commercial Lawn Mower (CML01Z), the 36V ConnectX™ Brushless Blower (CBU01Z), and the 36V ConnectX™ Brushless String Trimmer (CRU03Z). It optimizes battery life by actively controlling current, voltage, and temperature. The AC Power Supply and Charger has a built-in fan that circulates air through the charger during the charging process to cool the charger for faster charge time.