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this post was submitted on 11 Sep 2023
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Car batteries are cheap storage if you very rarely discharge them. You get many years if you are only using the top 80% or so of their voltage range, but if you discharge them to 50%, you only get a few hundred cycles, and if you discharge to 0%, you get dozens, if that. "Deep cycle" batteries have the same characteristic, but tend to give you more amp-ours before you hit those thresholds.
Good Lifepo4 batteries could last up to 10 years with daily full discharges. They are quite amazing in that respect. They are also likely safer than even lead acid -which need to be vented properly to avoid hydrogen gas buildup. They don't get thermal runaway like lipos, but the cells are very much capable of producing enough current for electrical fires, so you want ones that are built properly. Maintenance is pretty much just "don't ever charge it if it's frozen."
I didn't know that deep-discharge batteries also had the same characteristics, TIL, and it makes sense based on my experience with them!