6v agm batteries
https://www.wholesalebatteriesdirect.com/lifeline-marine-batteries/60353-6v-220ah-concorde-lifeline-gpl-4ct-deep-cycle-marine-battery.html?gclid=Cj0KCQjw0a7YBRDnARIsAJgsF3MxZMo F6h4jF6C75vDvTr4YiEMdbhgh8f1w55oGGHg-_eD-eGDgWwwaAiyPEALw_wcB
Don't know anything about these but it seems like a deal
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