the other option would be a balancing charger. In effect a balancing charger is many small chargers in one case. In the case of a balance charger you would charge through the balancing tap. The balancing tap has a positive lead from each cell and a common negative lead. Using this method, each section of the balance charger charges a single cell. since Lipo chargers automatically trickle down as the cells charge, all cells will charge to the same value, before the charger signals the pack is fully charged.....Pat