Amazon.com: Ryobi 18-Volt Lithium + HP High Capacity 9.0 Ah Battery : Tools & Home Improvement
RYOBI ONE+ 18V Lithium-Ion 4.0 Ah Compact Battery (2-Pack) and Charger Kit with FREE Cordless ONE+ 4-1/2 in. Angle Grinder PSK006-PCL445B - The Home Depot
RYOBI ONE+ 18V HIGH PERFORMANCE Lithium-Ion 4.0 Ah Battery and Charger Starter Kit PSK004 - The Home Depot
18V ONE+ 6AH LITHIUM-ION HIGH PERFORMANCE BATTERY - RYOBI Tools
Metabo HPT MultiVolt 18-Volt 2-Pack Lithium-ion Power Tool Battery and Charger (Charger Included) in the Power Tool Batteries & Chargers department at Lowes.com