before you spend out on a new charger charge your packs as normal and test each cell with a volt meter each cell should have 1.2 volts minimum you could have a duff cell in each pack i would recomend you charge them a little higher 6 amps or so with a cut off of about 3mv from a fresh discharged pack you should be getting a goo 4000 mah in them. are you discharging with a single cell discharger or doing a pack discharge a pack discharge could also be the problem as you may not be taking all the power from the all the cells and when you charge again you will get a false peak as one or more cells have hit the delta peak early and shut the charger off. i hope this make sense
the best advise i can give is if your gonna spend money on a charger you will be better off getting one pack of lipos and a lipo charger it will prob cost about £100 but agro free.
stu rand
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