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POPSEEstor: Ultracapacitor Co. could power cars @ $9 per 500 miles Patent application claims that their ~52 kWh ultracapacitor would weigh ~350 pounds. EEstor also briefly outlines in the patent a partial business model in which "power banks" using EEstor technology could act as a "gas station" for electric vehicles (recharge time of 4-6 minutes). In addition, it would consume electricity from the grid at night and store it until it was sold--often during peak hours.