Amazon.com : Ryobi OP4050A 40-Volt Lithium-Ion 5 Ah High Capacity Battery : Tools & Home Improvement
RYOBI 40V HP Brushless 21 in. Cordless Battery Walk Behind Dual-Blade Self-Propelled Mower with (2) 6.0 Ah Batteries & Charger RY401150 - The Home Depot