18 Volt LXT 4.0 Ah Battery and Rapid Optimum Charger Starter Pack with Bonus 18 Volt LXT Brushless Cut Off Angle Grinder Commercial Electric It has an automatic air Item Weight:.625 It has an automatic air bleeder elegantly safeguarding kitchens and laundry rooms ) 40 Battery Amp Hours 4 Ah Rechargeable Yes Number of Total Batteries Included 2 Returnable 180 Day Power Tool Features No Additional Features Battery Power Type Lithium Ion Power Tool Accessory Type Battery Charger Set Color Family Teal AC\DC AC Number of batteries charged at once 1 Voltage (volts) 18 Charger Included Charger Included Battery Amp Hours2 4 the Charger has a built in fan to cool the battery for faster and more efficient charging