Balanceing tap with six wire"s?

I just received a a new flightpower evo 5350 mah 4s 14.8v lipo battery.
I have used several lipo battery's before the ones i have now only
have 5 wires on the balanceing tap,this one has 6. I know it is only
4 cells,but what is the extra wire for?Iam useing a hyperion duo charger
for chargering and balanceing,and i need to change the tap plug to use
for my hyperion charger,but what about that extra wire?