Subscribe to our Newsletter. DEWALT 21.5 in. 20-Volt MAX Lithium-Ion Cordless Battery Walk Behind Self Propelled Mower. The item “DEWALT 21.5 in. 20-Volt MAX Lithium-Ion Cordless Battery Walk Behind Mower” is in sale since Tuesday, March 9, 2021. This item is in the category “Home & Garden\Yard, Garden & Outdoor Living\Lawn Mowers, Parts & Accessories\Lawn Mowers”. The seller is “tools_direct” and is located in Multiple Locations. This item can be shipped to United States.