6.4V 9Ah custom lithium battery pack are the most cost-effective
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Reely 24971 Spare part 6.4V 500 mAh Li-ion battery | Conrad.com
IFR26650F 6400mAh 6.4V Power Tool Rechargeable Batteries with Long Life Cycle
Buy Wholesale China Lithium Battery Li-ion Battery Pack Lifepo4 3.2v/6.4v /9.6v/12.8v Rechargeable Battery Batteries Pack & Lithium Battery Pack Lifepo4 Module at USD 0.8 | Global Sources
Amazon.com: 2 pcs 6.4v 750mAh 16500 LiFePO4 Battery for WLtoys A949-A A959-A A969-A A979-A RC Truck Car : Toys & Games