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
18V ONE+™ Hybrid Fan - RYOBI Tools
RYOBI ONE+ 18V Lithium-Ion 6.0 Ah LITHIUM+ HP High Capacity Battery P193