Amazon.com : Ryobi OP4050A 40-Volt Lithium-Ion 5 Ah High Capacity Battery : Tools & Home Improvement
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Ryobi R18CK4F-252S 4-piece combination set 18 Volt 2.0/5.0 Ah Li-ion 5133004771
RYOBI 40V HP Brushless 18 in. Cordless Battery Chainsaw and 10 in. Cordless Battery Pole Saw with 5.0 Ah Battery and Charger RY40580-PS - The Home Depot