An illustrative embodiment provides an apparatus comprising a positive electrode, a negative electrode, a separator, a first conductor, and a second conductor. The positive electrode and the negative electrode are separated by the separator. The first conductor is configured to transmit a first electrical current from the positive electrode. Also, the second conductor is configured to transmit a second electrical current from the negative electrode. A direction of the first electrical current transmitted through the first conductor is substantially opposite to a direction of the second electrical current transmitted through the second conductor. A magnitude of the first electrical current is substantially equal to a magnitude of the second electrical current. The first and second conductors are proximate to one another and a first portion of one of the first and second conductors is located inside the case along a separation distance, and a second portion of the one of the first and second conductors is located outside the case along the separation distance.