The RYOBI 40V HP Brushless 20” Self-Propelled Lawn Mower delivers more power than a 150cc gas mower, making it a true gas replacement. Ideal for up to 1/2 acre, this mower comes with an included 40V 6Ah lithium battery for up to 40 minutes of runtime. The brushless motor and advanced electronics automatically react to mowing conditions by increasing the blade speed to eliminate bogging down and powering through the toughest cut. Equipped with self-propelled rear wheel drive, this mower ensures an effortless, efficient mowing experience. For your utmost convenience, adjust the height of your cut with the 7-position single point height adjustment. When you are finished, easily fold the handles and store vertically for compact storage. Best of all, it is part of the RYOBI 40V system where any 40V battery works with any 40V product. This self-propelled mower is backed by the RYOBI 5-Year Manufacturer's Tool Warranty, 3-Year Manufacturer’s Battery Warranty, and includes RY401018 40V HP Brushless 20" Self-Propelled Mower, OP40605 40V 6Ah Lithium Battery, OP408 40V Fast Charger, Grass Catcher Bag, Start Key, Mulch Plug, Side Discharge Chute, and Operator's Manuals.