No Runtime!!!

I have my 13 tooth pinion on the buggy and now I have the same problem as before. Three minutes of run time per pack four or five cells. I think my charger has a setting I can't find. When the 5s1p pack comes off the car is is aroung 9 volts. I have to charge it as a 3 then a 4 then a 5 cell pack on my hyperion charger 610i. This whole process takes less than five minutes until the charger stops. Does anyone know what setting I need to change to get the charger to charge my batts?????