Are you talking about the Neey 4A? I have 2-- 6S lithium ion batteries, connected in series. So 12S @48volt. Leo told me I needed 2 balancers.1 FLfor each battery. I wondered about that. So are you saying connect the black to neg, as usual for balancers 1-6 wires to the next 6 wires, then 7-12...