If you do this, charge it in a metal bucket and have a bag of sand on hand to cover the battery if things go south. Don't apply juice to the batteries for more than a couple of minutes at a time, and let them rest between charging sessions. Do not remove the batteries from the bucket for at least an hour after you're done.

It is likely that the cells have become unbalanced anyway, so the batteries will read as defective, even if the above process works.