https://www.homedepot.com/p/RYOBI-O...-PERFORMANCE-Battery-PCL401B-PBP003/339884691 Ryobi ONE+ 18V Cordless 1/4 Sheet Sander w/ 2 Ah High Performance Battery (PCL401B-PBP003) on sale for $59. Shipping is free or choose store pickup where stock permits.