On an 03 Element with lead acid battery, what others said.
I just put a small solar panel on my new CR-V to keep it topped off because I noticed the start-stop doesn't work if the battery isn't at maximum capacity, and because I don't drive it much.
If you want to save the small amount of power that the car consumes while sitting, maybe consider a small 3 dollar solar panel? It's very miniscule in terms of fuel, but nicer to the battery if the car sits a lot.
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