OK so I have a Bantam BC6-10 charger. All this time I have just plugged the balancing wire into the charger and "charged" my battery thinking it was balancing them. I do not think so. I do have several options on my charger; "charge", "fast charge", "storage", "discharge" and "balance".

So now I tried to select "balance" when I start I get the error "Batt Vol ERR cell connect"

Lastly the battery is a Venom 2cell 500mah 3S charge rate battery. I am selecting 5 amp "balance" at 7.4V.

What am I doing wrong?