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They're probably dead, but you can try and see if they take a charge. If they don't, I think replacing the electrolyte and trying again would be a good idea. They're supposedly heavier and less efficient than lead acid batteries so using them could make for a really slow/lossy NEV, but they're also supposed to be more durable. Great for backup power at a home IMO if the claims about their lifespan/maintenance are true.
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