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The longevity really interests me too. A lead acid battery is usually rated for about 200 complete charge and discharge cycles, and in real life might only last a few years. A LiFePo4 battery is about 2,000 cycles, or in real life at least 10 years. A cap is rated at a million cycles. Of course you do use more of it's cycle, but still these will probably outlast the vehicle.
Also if you completely discharge a lead acid battery just once, that takes off half of its life right there. Lithium batteries are even worse. But if you completely discharge a capacitor it doen't harm a thing.
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