The RYOBI 40V HP Brushless 20" Self-Propelled Multi-Blade Mower delivers more power than a 150cc gas mower, making it a true gas replacement. The included 40V 8Ah battery provides up to 55 minutes of runtime on a single charge, ideal for up to 1/2 acre. RYOBI 40V HP Technology utilizes a brushless motor & advanced electronics that automatically react to mowing conditions by increasing the blade speed to eliminate bogging down & powering through the toughest cut. Experience the industry’s best 3-in-1 cutting performance with the CROSS CUT™ Multi-Blade System. This allows for less clumping when mulching, further & more even dispersal when side discharging, and when bagging the fine clippings fill from back to front to maximize space for less bag changes. Equipped with self-propelled rear wheel drive, this mower ensures an effortless, efficient mowing experience. The single-point height adjustment allows you to easily select the perfect height for your lawn. When the job is done, the handles easily collapse for compact, vertical 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 40V Brushless 20" Self-Propelled Multi-Blade Lawn Mower, 40V 8Ah Lithium Battery, 40V Rapid Charger, Grass Catcher Bag, Start Key, Side Discharge Chute, Wrench, and Operator’s Manuals.