18V, Lithium-Ion Charger, Technology Controls Current, Voltage & Temperature To Maximize Battery Life, Central Processing Unit Analyzes Data From The Battery's Memory Chip, Forced Air Cooling Fan, Cools The Battery By Forcing Cool Air Through The Battery's Built In Air Vents, Fast Charging Quickly Charges An 18V, 3.0A Hour Lithium-Ion Battery In Only 45 Minutes.