the B6AC has integrated balancer.
That small white plug is the balancer plug, you plug both wires into the charger and set the charger to lipo charging mode. You do not discharge lipos. Leave them with charge in them when you store them.
You WANT the nanotech batteries... they have a safety cutoff for low voltage so it's impossible to damage them by overdischarging the batteries. Always good to have another level of safety. The batteries will stop working when they hit the voltage cutoff to prevent damage. And for the price, you can't go wrong.
I run the exact same charger and several of the nanotech turnigy batteries.