Amazon.com: Synergy Digital Power Tool Battery, Compatible with Ryobi RP4530 Power Tool, (Li-ion, 4V, 2000mAh) Ultra High Capacity, Replacement for Ryobi AP4001 Battery : Tools & Home Improvement
2000mAh Ryobi AP4001 Battery for TEK 4 RP4470 AP4700 RP4900 RP4410 RP4530 AP4302 HP53LK TEK4 RP4310 RP4550 RP4400 - Walmart.com