STIHL RMA 510 21" Battery Push Lawn Mower delivers gas-like cutting power in a quiet, zero-exhaust-emission 36V AP System push mower. Built around a rugged 21" steel mowing deck with a 20" cutting blade, it offers 3-in-1 mulching, rear bagging (19.8-gallon grass catcher), and side discharge versatility, dual AP battery compartments (one active, one storage), and 7-position single-point height adjustment from 1.4" to 3.9".