It's Official - Ryobi 18V 6ah and 9ah and Compact 3ah batteries are Real! Probably using 20700 Cells - Tool Craze
Power Inverter For Ryobi 18V Series Lithium Battery to AC 110V w/Dual USB Ports | eBay
toolboy's Corner: Ryobi 40v Batteries
Ryobi Celebrates 25 Years of Cordless Tool Battery Compatibility
18V ONE+™ 4.0AH BATTERIES 2-PACK - RYOBI Tools
Batterie lithium-Ion Ryobi 14.4 V - 1.5 Ah | Castorama
High Capacity New 18v 6000mah Li-ion For Ryobi Hot P108 Rb18l40 Rechargeable Battery Pack Power Tool Battery Ryobi One+ Hot Sell - Rechargeable Batteries - AliExpress