comparison Tesla s-85 Battery

UltraCap Multi Layer Solid State Energy Storage Device (ESD)*

* Data are based on a conservative dielectric constant (k) of 1 million

The company’s battery will weigh just over 60 kg as compared to the massive 544 kg of Tesla’s 85 model.

  • Energy density of 4,500 (Wh/Liter) versus 700 (Wh/Liter) for Tesla S-85
  • Specific energy density of 1,049 (Wh/kg) versus 200 (Wh/kg) for Tesla S-85
  • Gravimetric power density of 6,349 (W/kg) versus 516 (W/kg) for Tesla S-85

The key advantage of our approach to solving the energy density problem of our ultra-capacitor, is the incorporation of dielectrics with a very high specific capacitance rather than relying on high charging voltage. Companies like EEStor use a high charging voltage of 3,500 V with a very low dielectric constant of 18,000. UltraCap has recently reached a new milestone with a dielectric constant of several millions.


By developing a very high capacitance dielectric, it will be possible to store larger amount of charge at lower voltages (eventually all the way to 220V) thus making it easier to charge and possibly eliminating the need for specially constructed charging stations. In comparison with Tesla’s battery, which requires a charging time of 12 hours, Ultra-Cap’s energy storage devices will be fully charged in only 4 minutes. These results can lead to a total reduction of cost of around 30% per kilometer.