A graphene-based field effect transistor includes source and drain electrodes that are self-aligned to a gate electrode. The contact is fittable around the rod with the limbs flanking the rod and the upper and lower bores of the limbs aligned with the respective upper and lower bores of the rod. The secondary jaw is connected to the primary jaw between the second top edge and the bottom tail in a relationship of being movable and slightly rotatable with respect to the primary jaw. Manufacture of a sealed storage battery is simplified by obviating a manual operation of inserting and bending an elongated connection tab inside the container. The device can also be a field effect transistor device by adding a gate contact and a gate dielectric.