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And that is one of the points that I was getting at: I don't think the batteries from LithiumMoto are going to be anywhere near as "good" for this application as the batteries that you could build for yourself. While the LithiumMoto 11.5 Ah battery still has more energy available overall, it is not sufficient to power a vehicle sans alternator for very long, and, in terms of weight savings, I don't think it is that much better of a value than Odyssey's 15lb AGM battery with (if I remember correctly) ~ 10 Ah.
The big problem with building one's own battery sufficient to run a car without an alternator is cost because, at the cheapest I've found, it would cost about $700 to build a 100 Ah, 12V battery that weighs ~ 30 lbs. Price drops significantly with lower Ah, but as others have stated, those batteries might only be sufficient for short commutes.
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