Amazon.com: RYOBI - 1 x Lithium + 36 V Battery Compatible with all 36 V Max Power Gardening Tools - 4.0 Ah - Individual Charge/Discharge Cell Management and Regulated Energy - BPL3640D2 : Tools & Home Improvement
Turpow 40V 6.0Ah Li-Ion RechargeableBattery For Ryobi RY40502 RY40200 40 V Cordless Power Tools Battery OP4050 OP4026 OP40401
Li-ion Replacement Battery 40V 5.0Ah 6.0Ah for Ryobi OP4050 OP4050A OP4026 OP4040 RY40200 RY40403 RY4050 Power Tools Batteries