couple of questions

[Gustav]

Balanced means that each cell in a pack is of matching voltage.An imbalance can damage the cells.You need a pack that has taps for each cell that are wired to a balance connecter that you plug the balancer into.most work by monitoring the voltage of each cell and discharging cells individually untill they match.There's no standard for balance connectors so you may need an adapter lead to use certain packs with certain balancers.