Well, I missed out on the Yale option.
Now time to sheet or git off the pot.

Did see some on-line sellers of the battery charger (svr24251205/6) and some did mention it was switchable but had no details. That could be referring to the replacement "Quick Charge brand. Looks like the charger is more popular in Raymonds based on my Google skills.

Yes, those gells do stand on their end.

A quick search produced no repair/service manual for that charger.

Even if I was bold and used the marine battery setup, any charger I would buy would be 6 or 12 volt. I'd have to fiddle with the wiring to get it to "see" 12 volts.

Burn $840 on 4 batteries or burn labor trying to get the lower $$$ marines to work. Not sure how to compare CCA vs Ah.

Thanks again.