MATABLE ENERGY STORAGE DEVICES

The disclosure is directed to methods and systems for an energy storage system having a capacitor module configured to store energy as an electric field of the capacitor module, the capacitor module including a capacitor terminal, and a battery configured to store energy as a chemical form of the battery, the battery including a battery terminal, and the battery terminal including a cavity. The cavity of the battery terminal is configured to receive a portion of the capacitor terminal to mechanically couple the capacitor module to the battery and to electrically couple the capacitor module to the battery. The electrical coupling allows for energy to flow from the capacitor module to the battery via the terminal to provide voltage to the battery.