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Buy a deep cycle lead acid battery. I have had several years service under heavy use from an Odyssey unit. Make sure it has a metal jacket to ensure against expansion of the lead plates in the heat. Get the Odyssey trickle charger and plug in at night. Cheaper ways are marine deep cycle batteries, but I think I got a lot better service life out of mine with the higher price. And it's a lot cheaper than a lithium set up. Also, I really think that some smart alternators might struggle a little with charging lithium properly.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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