12v lithium batteries are popular in RVs these days since they are lighter, more powerful, and able to be discharged deeper than traditional lead/acid batteries. I was in Camping World on 441 last week and they had a display of them at the parts counter. I'd check with them or another RV dealer. I did a quick Google search and it appears that battery recyclers will pay a dollar a pound and up for a big lithium battery.
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