This unique design serves as both a charging and balancing cable for up to six of your 2S battery packs. Connect to your batteries with the JST-XH connectors, as used in the T-Rex 150. Connect to the charger's main output with 4mm banana plugs, and to the balance port with a standard 2S JST-XH balance connector. Top-quality silicone wire gives you the flexibility you need to easily get everything connected.