I assume they are sensor leads. the charger has the main + and - wires comming out of the charger, and then each lead has a smaller wire that ran with the bigger one and they were both attached to the clips at the end. I hooked the balancer up to the + - leads and disattached the smaller wirres. the smaller wires have now been attached on the output end of the balancers +- wires. did I do this right?