RYOBI ONE+ 18V Cordless 4-1/2 in. Angle Grinder Kit with 4.0 Ah Battery and Charger PCL445K1 - The Home Depot
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 P423 18V One+ Brushless 4-1/2" 10,400 RPM Grinder and Metal Cutter w/ Adjustable 3-Position Side Handle and Onboard Spanner Wrench (Battery Not Included, Power Tool Only) - Amazon.com