There’s a lot to love about the RMA 510 battery-powered lawn mower from STIHL. First is its performance. Part of the AP Series, the RMA 510 features a 21″ deck for faster cutting than previous models. It’s also convenient – enjoy instant starting, less noise, zero gasoline costs, and zero exhaust emissions. The RMA 510 also includes a holding slot for a second battery so you can swap batteries and be ready to cut again in seconds. It also features an adjustable handlebar, grass catcher and larger rear wheels for riding over rough terrain.