RYOBI ONE+ 18V Lithium-Ion 4.0 Ah Battery (2-Pack) PBP2005 - The Home Depot
Ryobi P197 Battery ONE + (PLUS) Compatible Replaces P108 Rechargeable Lithium Ion 18 v Volt 4.0 Ah / 72 Wh UL Listed Faster Recharge Single Battery with Fuel Gage - - Amazon.com