Amazon.com: Synergy Digital Power Tool Battery, Compatible with Ryobi OCS-1840 Power Tool, (Li-ion, 18V, 9000mAh) Ultra High Capacity, Replacement for Ryobi BPL-1815 Battery : Tools & Home Improvement
Ryobi One Plus 18v Accessories | Ryobi 18v Battery Accessory - P108 4.0/6.0/9.0ah 18v - Aliexpress
Amazon.com: Synergy Digital Power Tool Battery, Compatible with Ryobi OCS-1840 Power Tool, (Li-ion, 18V, 9000mAh) Ultra High Capacity, Replacement for Ryobi BPL-1815 Battery : Tools & Home Improvement
RYOBI ONE+ 18V Cordless Electrostatic 0.5 Gal Sprayer with 2.0 Ah Battery and Charger P2890 - The Home Depot
Ryobi P7131 P713 Universal Attachments Adapter for the 18V - Etsy Sweden