An apparatus includes a separator/electrolyte assembly (304); a first energy storage portion (304/306) disposed on a first surface of the separator/electrolyte assembly (304); a second energy storage portion (304/308) disposed on a second surface of the separator/electrolyte assembly (304); a first metallized piezoelectric film (310) disposed on the first energy storage portion (304/306); and a second metallized piezoelectric film (312) disposed on the second energy storage portion (304/308). When a force is applied to the first metallized piezoelectric film (310), a piezoelectric effect converts mechanical strain into electric potential and each energy storage portion stores the energy converted in the first energy storage portion (304/306) and the second energy storage portion (304/308) for subsequent discharge from the first energy storage portion (304/306) and the second energy storage portion (304/308) to an electronic device.