Powered by 18 V 4.0 Ah Li-Ion slide-style battery, Model XSF03M features BL™ Brushless motor which is electronically controlled to optimize battery energy use. Star Protection Computer Controls™ allow tool and battery to exchange data in real-time and monitor conditions during use to protect against overloading, overdischarging, and overheating. With Push Drive™ Technology, contractors can set lock-on setting and motor will start only when fastener is engaged, saving battery power.