SKU XML11CT1. 36V (18V X2) LXT 21" Self-Propelled Lawn Mower (XML11Z). (4) 18V LXT Lithium-Ion 5.0Ah Battery (BL1850B). Form Factor (LXT) X2. 21" Lawn Mower Blade (191V96-5). Ergonomic plastic deck weighs less for reduced required push force and easier transport.