[Dmatz]

How old are the batteries? If you disconnect the cables and measure the voltage and they are all not within a .1 volts of each other it will not be possible to charge them properly. If you have a bad battery it will bring the rest of them down as well. If the batteries have been complexly discharged they have been damaged. If you need to replace you really need to do them as a complete set or they will not balance properly. I do not know the testing procedure for you balancers. I would guess you have a bad battery or several.