Abstract: A mechanical latch relay started by a current pulse is disclosed which comprises an electromagnetic generating unit, a connecting mechanism and a mechanical locking mechanism, and which can maintain the existing operation state when the current pulse starting the relay disappears, and it changes its operation state when another current pulse is provided, and then it keeps the operation state even if the pulse disappears so that it can provide a stable operation state of current on/off unnecessary to be provided with a current for a long time, which enables to provide an effective control for current on/off.

Abstract: A two terminal dual battery with a micro-processor base controller is incorporated into a single unit. Two 12 volt batteries are contained in a single housing sharing a common negative terminal and a single positive terminal. The auxiliary battery is permanently coupled to the external terminals of the battery. A starter section may be coupled to the external battery terminals in parallel with the auxiliary section using a latching electromechanical relay. The relay is controlled by the micro-processor in response to external inputs and battery parameters. One section of the battery is constructed for deep cyclic uses and normally provides power to run auxiliary loads while the other battery section is constructed to fulfill requirements of low internal resistance and efficient low duration high current output.