Speaking of You Tube videos, here is a video of how the Odyssey batteries are made.
https://www.youtube.com/watch?v=3P-wq...eature=related
Here is a better video of how to recharge a deeply discharged Optima. I suspect this proceedure would work with any deeply discharged AGM battery.
https://www.youtube.com/watch?v=Slqd7...eature=related