By 'low' what voltage are you actually seeing? And are you charging to full capacity? I have a different charger from you and you can change the capacity stop point.
Are you charging from mains or 12v source?
If your not sure about the charger, find someone who's cells are charging to a higher voltage and see if yours will do the same on their charger.
One final question, how old (much use) are the cells?
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