Makita DC18RA Rapid Battery Charger for Li-Ion Batteries N/A Imported Charging Technology: Controls current, voltage & temperature to maximize battery life Central Processing Unit (CPU): 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 3.0 Amp hour Li-Ion battery in only 30 minutes