30cm (12") Charge Lead for Batteries with EC3 Connector from BenchCraft - BCT5002-011
Specifications:

Necessary to connect your EC3-equipped LiPo battery with your Banana Plug-equipped LiPo battery charger
Length: 300mm \/ 12 inches
Wire Gauge: 16AWG
Connector Type: Banana Plug and EC3 Connector male