This XT90 anti spark serial adapter can used to connect two batteries in series together. It is made of genuine Amass connectors and quality soft 10 gauge silicone wires.
Use this adapter to connect two batteries with XT90 connectors in series to get higher voltage, yet the same capacity. For example, if two 6S 22.2V 5000mAh batteries connected in series with this adapter, it will be a 12S, 44.4V, 5000mAh battery pack. Made of 10 gauge soft silicone wires, each approximately 4 inches long.