What I find interesting, even though it's not a proper comparison, is that a new pack of lead acid batts to power the ForkenSwift 30-40 miles on a charge would be about half the price of the cheapest hybrid replacment pack listed above.
Of course, the lead pack would be toast after about 10-20k miles; where the hybrid packs, with careful state of charge (SOC) management, are lasting many hundreds of thousands of miles in some cases..
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