I now buy all my batteries from WalMart. They're under $100 for a three year full replacement. I don't have the truck here at the moment, but you can get a larger size battery in a Gen 2 with a slight modification to the tray.

I remember your issue with Optima batteries not too long ago. I recently read a tech article on charging AGM batteries that are very discharged. Apparently most chargers can't handle the way an AGM battery needs to have charge applied, so the suggestion that was made was to use jumper cables from a known, charged battery to the discharged AGM battery, then connect the charger to the regular battery and charge them that way. Worth a try anyway, in case you run into that again.

John B.