The RYOBI 40V HP Brushless 21" Self-Propelled Mower delivers more power than a 163cc gas mower, making it a true gas replacement. Dual active battery ports and (2) included 40V 6Ah lithium batteries give you up to 70 minutes of runtime for easily tackling up to 3/4 acre. 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. The 21” durable polypropylene deck is lightweight, resists corrosion, and is covered by a lifetime warranty. 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 mower is backed by the RYOBI 5-Year Manufacturer's Tool Warranty, 3-Year Manufacturer’s Battery Warranty, and includes RY401014 40V HP Brushless 21" Self-Propelled Mower, (2) OP40605 40V 6Ah Lithium Batteries, OP406 40V Rapid Charger, Grass Catcher Bag, Start Key, Mulch Plug, Side Discharge Chute, and Operator's Manuals.