Amazon.com : Ryobi OP4050A 40-Volt Lithium-Ion 5 Ah High Capacity Battery : Tools & Home Improvement
RYOBI 40V HP Brushless 18 in. Electric Battery Chainsaw with (2) 5 Ah. Batteries and Charger RY40580-2B - The Home Depot
RYOBI ONE+ 18V Lithium-Ion 2.0 Ah, 4.0 Ah, and 6.0 Ah HIGH PERFORMANCE Batteries and Charger Kit w/ HP Brushless Chain Saw PSK007-P2502BTL - The Home Depot