cheap lithium cells are twice the price of lead, hight discharge rate cells that would be needed would be 4-6 times the price of lead. but you may be able to use less Ah capacity to get the same results. the right lithium battery might be only 2 or 3 times the old lead one.
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Nissan Leaf 24kwh. Average FE = 300mpg 3.6miles/kwh (@plug)
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