The LDX172C 7.2V Lithium Drill/Driver has a built in Lithium Ion Battery - Always Ready, holds a charge up to 18 months. It has a keyless chuck for quick and easy bit changes and a mid-handle design for balance and control. It has a fan-cooled motor that extends the drill life and two drill speeds plus forward/reverse to assure the right speed for the job. A great drill for general home repair and assembly