Synergy Digital Power Tool Battery, Compatible with Ryobi BPP-1820 Power Tool, (Li-ion, 18V, 9000mAh) Ultra High Capacity, Replacement for Ryobi BPL-1815 Battery - Walmart.com
Battery for RYOBI One + BPL-1820G BPL1820 RB18L50 P204 P103 P105 P104 P106 P107 | eBay