Bob, The message I get is: CH1 Bad S. Count/Node Wiring XH. Keep in mind, this 10s pack has only 2 charge wires (not 4) and 2 balance connectors. This is a single pack with 10 cells. I sure hope this charger is capable of this task because if it is, I'm in the process of saving at least 8-9 oz vs 2x5s packs! How does a Msytic with an AUW of <10lbs sound? Everette