Greenworks 21" 80 Volt Battery Powered Self-Propelled Walk-Behind Mower. Greenworks is the ultimate battery-powered outdoor equipment. The powerful 80 volt lithium-ion battery and revolutionary brushless motor technology provide true gas performance. The Cordless Push Mower has a 21 inch cutting deck, three-in-one mulch, side discharge, and rear bag capable. Five position single levered deck height adjustment provides cutting ranges from one and a quarter to three and 3/8 with for the best cut in all environments. The rechargeable lithium-ion battery uses cutting-edge technology to deliver maximum power and it's fully recharges in only 30 minutes. Smart cut technology mows up to 10,000 square feet on a single charge. The electric start is easy to use and its ultra quiet with minimal vibration versus comparable gas mowers. Hassle-free operation, no cord, no gas, no maintenance. Greenworks. Life gets easier.