Bosch DDS181-02 Compact Tough 18-Volt lithium-ion 1/2-in. drill/driver's 7-in. head length is the smallest in its class, yet it delivers top performance. Currently if you purchase DDS181-02 you will receive an additional Free Bosch High Capacity 18-Volt Lithium-Ion Slim-Pack Battery (BAT609) (Online Only). It works with all Bosch 18-Volt lithium-ion batteries, and this kit includes two Slim Pack 1.5 Ah HC (high-capacity) batteries. They provide up to 50 percent more runtime over standard lithium-ion batteries and include an electronic battery fuel gauge to ensure you have enough power for the job.