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
Amazon.com: ACDelco Gold 48AGM 36 Month Warranty AGM BCI Group 48 Battery , Black : Everything Else