RE: over discharged A123 pack
Run a discharge cycle on the now fully charged pack to see how much you are getting out of it. By my experience with A123 ( LiFe) batteries, this should not be an issue and might if anything reduce your packs life expectancy, and at worse case reduce its capacity by a miniscule amount .. These batteries are significantly more resilient over liPo and LiIon type cells .
~V~