Amazon.com: generic1 Ryobi ONE+ 18V Lithium-Ion 4.0 Ah Battery (2-Pack) and Charger Kit, 1 (PSK006) : Tools & Home Improvement
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
Ryobi 18V ONE+ 4.0Ah Battery and Charger Combo Kit - Bunnings Australia