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
Amazon.com : Ryobi OP4050A 40-Volt Lithium-Ion 5 Ah High Capacity Battery : Tools & Home Improvement