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I was trying to recall what someone had said about them. There are plenty of threads on NOCO. https://www.steelsoldiers.com/threads/on-board-battery-charger.178958/#post-2133596
https://www.amazon.com/ProMariner-43012-ProSport-Generation-Battery/dp/B00F5EBR1C/ref=sr_1_9?dchild=1&keywords=pro+mariner&qid=1612966907&sr=8-9
Been quite happy with this unit.