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You have heard a lot from EEstor in press releases but not through personal inquiries because they don't actually have them working yet. It's just a concept. If you plan on entering for the prize soon, supercapacitors most likely won't be ready in time.
Many larger capacitor designs also leak energy. We have to wait and see where the new technologies go, but the ones testing at many universities leak power (exponentially, as capacitors always discharge).
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