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The answer was "NiCd batteries are way too expensive, lead acid batteries are way too heavy, and both have way too short a cycle life."


Deep cycle lead-acid batteries have fine cycle lives, and indeed were (and are) used for driving golf carts. However, they trade off for lower specific power, which makes them unsuitable for a full-sized, highway-speed-reaching car.


The 2001 Honda Insight was built with NiMH cells -- not quite NiCd, but still doable.




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