Use this adapter to connect two batteries with EC5 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 9cm long. Net weight: ~45g, 1.6oz.