Quote:
Originally Posted by Richard Lowe
Also...
"If you get a cell that has flat lined to 0.0volts and will not charge, it can be bump started back to life by flashing it with 12volts. Use a couple of wires and spark the +ve 12volt to the +ve of the cell."
I have no idea if this works, I'm guessing you won't have to give them 12v for more than a second unless you want a melted puddle on the floor 
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That's the method I used to "force" charge mine.
Be sure you make the connection quickly and don't let it arc to much, as it might arc weld to the cell.