An energy storage device comprising at least one negative electrode, wherein each negative electrode is individually selected from (i) an electrode comprising negative battery electrode material; (ii) an electrode comprising capacitor electrode material; (...

A lead-acid battery comprising: - at least one lead-based negative electrode; - at least one lead dioxide-based positive electrode; - at least one capacitor electrode; and - electrolyte in contact with the electrodes; wherein a battery part is formed by th...