Honestly i had great luck out of my old battery tender plus. It finally died after 5 years of abuse. I used it to charge my deep cycles mainly and i think thats what killed it (would take 4+ days to charge two batterys) ive had those for 4 years now and still going strong. I also use it to keep the battery topped up in the cub between usage in the winter. I pull the battery out of my s10 and bring it inside on the heat and will throw the maintainer on it for a few days every other week. And rotate with a couple other batterys i have. So far ive lucked out with it. And brought one battery "back" with it for 50 bucks i really cant complain. I need to buy another soon
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