A control apparatus enhances charge and discharge performance of a main battery in a low temperature environment, extends the life of the main battery and improves the reliability of the whole system. A cable provides a means for inputting at least one video signal, at least one audio signal and electric power. The band is retained flush by a positioner securely locking down one end while the other end is provided at a housing body access location. However, in the best mode and in accordance with the present teachings, the gain medium lases at a frequency within 1% of the pump frequency. The switch also has a forward position that closes the first circuit and a backward position that closes the second circuit.