RYOBI 40V HP Brushless 20 in. Cordless Walk Behind Push Lawn Mower with 6.0 Ah Battery and Charger. Two years old, great condition, good power, runs for about 45 minutes on a full charge. 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. No gas, no maintenance, no hassle.