Spektrum IC5 Series Y Harness. Using this will allow the use of two batteries with the same ESC. Doubling the voltage to your ESC/motor. Made with IC5 Connectors and 4" (100mm) 13AWG gauge wire. Includes: Everything in the picture.**Note: You must use two battery packs of the same exact specifications, age, and quality. Failure to do so could cause a fire.**