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If you can find a source for used batteries that can suit your needs I'd say go with that. If you are forced to buy new batteries I'd have to say go with lithium because they'll be cheaper in the long run. If you're currently getting away with 100Ah lead batteries you should be able to go with a smaller lithium pack because of the advantage of being able to bring them down to a lower SOC. So, your $4k pack should only really cost around $3k. But now you need a charger and BMS to go with it...
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