The powerful 36V/18V Lithium Ion 4 Port Battery Charger (UC18YTSL) offers a host of benefits for cordless tool users. Perfectly sized to allow freedom and flexibility, multiple ports charge up to four (4) Lithium Ion slide batteries simultaneously, or one-by-one, depending on which charging mode the user needs. An indicator light displays when charging is in process and when the cycle is complete. Two (2) USB ports and two (2) AC outlets also provide additional convenience.The UC18YTSL is compact at just over 10 inches long and is ideal for a multitude of cordless powering solutions. The 4-port charger optimizes battery life with a stop-current detection system and also protects against overheating through a built-in temperature sensor, resulting in more effective and efficient job sites.