A walk-behind battery-powered lawnmower having an assembly of a reel unit and a traction unit articularly connected together in an arrangement wherein the reel unit can conform in its vertical position to the elevation of the turf which is being mowed. Coating includes a first layer of elastomeric polyurethane in contact with and adhering to wall, a second layer of elastomeric polyurethane in contact with and adhering to first layer, and a layer of textile embedded between first layer and second layer. The invention allows for improved efficiency in wind generation. Various methods for improving fault isolation and fault reduction are also provided.