High Quality Content by WIKIPEDIA articles! EEStor is a company based in Cedar Park, Texas, United States that claims to have developed capacitor for electricity storage, which EEStor calls the `Electrical Energy Storage Unit` (EESU). The claims are described in detail in two of the company`s patents, US 7033406 and US 7466536 . EEStor claims that its capacitor can store more energy than lithium-ion batteries used in portable devices for cheaper than the low-cost lead-acid batteries used in gasoline powered cars. Its claims, if true, would radically change the electric car industry. However, the company has repeatedly missed research deadlines and still has not publicly demonstrated the technology. Despite this, EEStor`s partner, Zenn motors, raised CAD$2 million from investors primarily on the promise of EEstor`s technology.